Well... Sound comes out...
 

I'm going to write two reviews.  The first is for the person who comes across this site and has to have the Beats.  The second is for everyone else.
 
 
Do you buy all your clothes from Abercrombie and Finch?  Is sound quality a distant second in the things you look for when buying headphones?  Do the rims on your car cost more than the car itself??  Then these are for you!!  Welcome to the Beats by Dre Studio headphones!  These are what everyone including your favorite athletes and celebrities are wearing.  We all know rappers make much better headphones than traditional headphone companies and with these you will be able to listen to your favorite music, just the way Dre does.  These phones are off the chain!!  They come with 2 cords, a nice box, some papers, batteries, a 1/4 adaptor and an airplane adaptor.  These Beats are fashionable and heads will turn when your rockin these cans down the street.  The sound leakage is so awesome that they will also be able to hear every word of what your listening too, but who cares bro?  Just like the Black Eyed Peas, you'll be rockin dem Beats an they probably want to listen to what your listening to anyway!  So do yourself a favor and grab a pair of studios cause these cans is just what the Dr. ordered!
 
Review 2
 
The good:
  These are lightweight and comfortable.  They have a Control Talk wire which is convient and They fold up nice.
The bad:
  The sound leakage is atrocious.  At 60% volume, not only can my roommate 12 feet away hear the music, he can understand the words.  These come with an airplane adaptor, but you would need to listen to you music at really low listening levels to be able to use these on a plane.  These are my first set of cans and I really didn't expect them to be as bad in sound quality as they are.  My turbine Golds sound better in everyway when compared to these and they are in ears and were $20 less.  Im not going to comment on the sound since others with more experiance have.  One fatal flaw in these and something to think about in the overall cost of the product is they require batteries to operate.  There is no pass-through switch to turn off the noise canceling function.  The Beats also have no auto-shutoff of this function if you forget to switch off the noise canceling feature. Which means if you forget to shut your Studios off, the batteries die and since the batteries are dead, you cannot listen to your music.  What kind of since does this make?  Welcome to the Beats by Dre Studios.  I would not recommend these unless you can get them for $130 USD or less.  On a side note, Ive read that a lot of the Studios have the screws comming out and people don't know what kind screwdriver is used.  It's a Torque 5 (from the website).
 
Best uses:  Ear warmers, showing everyone how well marketing works.
 
 

Not good.

I bought these a year ago for $150. If you have a decent home theater system and you have a club, jazz or disco preset, that's what these sound like. They have a fun grungy club sound to them. I think they are overpriced for what you get, at the time I didn't know any better comming from apple earbuds and JVC Gummies. The bad think about these is they are HEAVY. I weighed theses against some other IEMs I have and this is what I found.

Beats Tour 21.1 grams
MTPGs 21.7
Sennheiser IE8 15.9 grams
Diddy Beats 26.1 grams

When I first got them I couldn't for the life of me get them to stay in my ears. I checked around and another head-fier suggested I cut the triple flange tip into a double flange. I tried this and it worked great! With this mod and the shirt clip they don't fall out anymore. I would recomend these if you can get them for around 60-75, they aren't going to be your primaries and enjoy a fun grungy club sound with your music.

I bought these a few days ago at Walmart. At first I thought they were broken, the treble was so far extended that it became shrill. After listening to these for 10 min I got a headache. I returned them and got another pair and i got the same sound again. I decided to let they burn in the rest of the afternoon and night. I tried them again the next day and they sounded almost the same with none of the shrillness removed. I've never had this problem with any iem I've ever owned and I've owned a lot of cheap ones. The bass was nice, but not $150 nice. I can see why people on here don't like them. Someone said they are like the abercrombie of headphones and I think they are right. The build quality seemed good except for the control talk which seemed a little flimsy.

Summery: Save your money. You can get better IEMs for a lower price such as the Shure 215 and S4i made by klipesh I think. If you just have to have the beats, get the Diddy Beats, i have them and they won't fatigue your ears like these do, just don't expect a lot from them. I'm returning these and going to check out the power beats tomorrow just for the hell of it. If someone gave me the beats tours, I'd give them back.

Best uses: decoration, AM radio, learning about ear fatigue

Note: I'm a noob and relise that there are reviews written by members on here with much more knowledge and experence than me and who also have a better understanding of the terms used to describe there experience with these headphones. So I'm writing this review from a noobs standpoint to others who might have just joined this site and are going though the same thing I did.

These are the best headphones I've owned yet! I'm a noob and want to thank this forum for showing me there is something more than the Beats and BOSE lines of headphones. This is the first pair of $400 headphones I've owned and I absolutely love them!

I owned a pair of BOSE IE2s, I thought they were good but with no sound isolation and very little in the way of bass and the fact I couldn't get them to be loud enough in the gym really kept me from liking them. I saw the Dre Diddy Beats and decided to give those a try. Moving up from the BOSE I liked the sound quality and the extra low end bass a lot more. The control talk worked very well and is one of the reasons I still use them. They are very heavy, the cord has a big metal piece at the "Y" and although the linguini cables look cool and are tangle free, they are heavy as well. All this wreaked havoc on the buds being able to stay in my ears and using them at the gym was a no go. I was not too impressed with the sound quality for $150, but the control talk was very useful to me so I kept them. I did some research online and saw that a lot of sites quoted this site for accuracy and reviews on headphones so I decided to check it out. Here I found exactly what I was looking for.

I read a lot of reviews on different IEMs and decided to go with the Monster Turbine Pro Golds. Moving up from the Diddy Beats I couldn't believe the sound quality. I had no idea that kind of sound quality could be expressed though IEMs. I could here a lot of sounds and textures in notes that I could only here in my home theater set up. I showed them to a few of my friends and they absolutly loved them. So at the danger of their wives sending them to the couch for a week for spending $280 on headphones, they went out and bought a pair for themselves. I was very happy with them, but they were still lacking something, something i couldn't really put my finger on. When I listened to music through my home stereo there was a presence in the music, an expansive range in the sound that made me feel as if I was sitting in the studio listing to it being recorded. Ive come to know it from reading reviews on here as sound stage. Although the Turbines were very clear and the bass was accurate (when compared the the Beats line), the music seemed small. So I kept looking and read the reviews on here for the Sennheiser IE8s and decided to buy a pair.

The IE8s
When I first listened to these I seriously questioned my sanity. The bass was muddy and tubby, the mids seemed like they needed to be recessed a little more and the treble was a little hard to here because of overpowering bass. After about 10 hours of "burn in" they settled in a little and after around 60 hours their true sound really started to shine. I absolutely love these, I haven't listened to other headphones in this price range except for the Dre Beats line, which I think is like the Abercrombie of headphones, so I can't really give an accurate review. I can say I have found exactly what I was looking for. When Im listening to music with the Turbines It's like going to a 5 star restaurant ordering the crab ravioli and having it served to me on a paper plat with a spork. Even though the ravioli is excellent in every way, the way it is delivered brings down the experience as a whole which is how I felt when I listened to the Turbines. After listening to music with the IE8s, I feel like I have all the silverware and the glass bowl with the best waiter in town to serve it to me. The presentation of the high quality sound that comes from the IE8s is remarkable! They make almost everything I listen to with them sparkle. Its kind of like watching a great movie at the movie theater (Turbines) and then seeing that same movie in 3D (IE8s). The music is much more impactful and much more fun to listen to. I am planning on getting the Fiio E7 portable DAC/amp. If your a noob like me I would recomend this. I'm also going to get some custom ear tips made for these. I can't say enough good things about these "home theater in your ear" headphones. Buy them, you won't regret it!

EDIT: I ordered the IE8i lead from Custom-Cable. It works with the IE8 if you use apple products and want the control talk.