Pros: Deep, thumpy bass, fantastic isolation, comfortable (for me)
Cons: Very recessed mids, non universal inline controls
So I'm relatively new to the world of high end headphones, and I've started by experimenting with over the ear cans, I'll move onto IEMs eventually, but I feel like these guys get a bad rap.
As for what I like, I like to listen to my electronic music, so the bright (and not overshadowed) highs and thumpy bass make for a good, enjoyable time. I wish the mids were as present, but this is a Beats product after all, so know what you are getting. These aren't for audiophiles. I also have to say that the collection of tips is a mixed bag. For one, it allows you to find a great fit that can really enhance the sound, but you have to spend some time testing each pair, almost every pair sounded like crap for me, until I tried the larger of the 3 level dome tips, they fit like a glove, never fall out, and really enhance the sound. They also isolate the outside world and have next to zero sound leakage. I can have these at full blast and the person in the car next to me won't even know I'm listening to anything, and as for road/airplane noise, forget about it.
I've read a few people saying they have low build quality, and it's possible I got a unicorn, but these have been my main in ear phones for almost 2 years now and they still look brand new, and sound just as good as day one. I've had no cable issues of any kind.
I wish the inline controls were better, they worked fine on my iPods, but since I've moved over to my S4 for all my mobile listening, the controls/mic don't function at all, so keep that in mind.
Outside of that, these are great if you want a relatively cheap pair of headphones that sound decent, will block out outside noise, and have bass to spare. As far as a quality:price ratio goes, I'd liken these to the Skullcandy Ink'd, which in my opinion are a great option for a $15 pair of headphones, so long as you are willing to replace them ever 6-12 months. These are a bit of an upgrade in sound quality and build quality, and last a heck of a lot longer, so long as you pay.