Figured I could help answer these at least a little bit.
 
 
1.  Just used them extensively on airplanes over the holidays.  They isolated well and kept the screaming kids and babies at bay.  The only thing that they didn't stop was when I was seated right next to an engine (as in I look out the window and all I see is engine).  They reduced that to a dull hum.
 
2.  Fairly large head here.  They were comfortable enough for a 2 hour continuous trip, though I was starting to feel it on the top of one ear as it seemed to be pinching a bit with my glasses.  Adequate comfort, but not great, nowhere near Beyer pads or anything like that.
 
3.  I'd assume so.  My ipod classic was driving them well enough.
 
4.  Can't help you on that one.  They have a pretty good range and movie soundtracks sound good, but no real idea.
 
Hope that helps.
 
Edit:  I did forget to mention that I did have one major issue using these as my travel headphone.  Apparently I have a neck like a gorilla and since the cups on these don't fold flat I ended up wearing them like some kind of weird neck muff when I was in a hurry and running from terminal to terminal. 
Quote:

iiiiiiiiiiiiiii said:

Headphones are like hit or miss for people on here and most of the time when someone spends $100 or more on a pair of headphones and doesn't like them they are sure to tell you about it. 
 
Examples of love or hate with no in the middle are K701, Grado SR60i, Grado SR80i, HD600/650. I was seriously considering buying a pair of the HD-25-ii and still am but its post like this one that make me think twice. 
 
While we are on topic of the HD-25-1 ii my questions is
 
1: Will they be good for use on airplanes? Even the smaller noisy ones?
 
2: Will they fit someone with a huge head? Will they be comfortable for at least 3 hours on someone with huge head? And by huge head I'm talking XL in helmet size. 
 
3: Will they sound good out of a Samsung Galaxy, Blackberry Playbook, or Asus Transformer Prime? Or Asus 1215b?
 
4: How are they for movies?

Click to expand...

 

Quote:

enter darkness said:

I own the adidas version and the only thing i hate is the adidas branding. Blue is my favorite color so i like the color scheme. But adidas branding makes me feel like a tool when going out.

Click to expand...

Jeez, following me around much

Thanks Triggerfish. I'm glad to hear that they will be fine unamped. I love the comfort of my M50 so I think I could tolerate the HD-25-1 ii.
 
Also thanks for the info about the isolation. From what you say it appears they isolate better than the m50 and from searching and other post it looks as if the Senns are an improvement in the sound department. 
 
For $200  the Senns are at the top of my list. Thanks to you and the other nice person earlier in this thread. 
 
And about the cups not folding flat. If I wear my M50 around my neck and don't fold the cups flat it feels like a neck brace...lol. But the Senns cups seem smaller than M50. 

how would u compare this to an amped SRH840?? i use a audinst rig, which is a dac/amp combo, but a cheap one.
 
can someone with both tel me the difference between them??
thaks

If OP's interested in some smashin' build quality go get yourself a pair of DT1350's. Since  shifting my hd25's I haven't looked back - fantastic alternative.

Or a V Moda M80...or AIAIAI TMA-1. Both of those have a similar signature and are very well built.
 
Quote:

rovex said:

If OP's interested in some smashin' build quality go get yourself a pair of DT1350's. Since  shifting my hd25's I haven't looked back - fantastic alternative.

Click to expand...

 
 

Hi there,
 
My HD25s are just over a year old. Over the past year, I've worn them in freezing temperatures, blowing snow and pouring rain, and subjected them to numerous falls. So I'd say the HD25s are quite rugged, even if they're plastic. In real-world use, the HD25s are among the toughest headphones around. Just my two cents.
 
But yes, they look cheap. The design is decades old, but hey, if it ain't broke, why fix it?

Quote:

12345142 said:

Hi there,
 
My HD25s are just over a year old. Over the past year, I've worn them in freezing temperatures, blowing snow and pouring rain, and subjected them to numerous falls. So I'd say the HD25s are quite rugged, even if they're plastic. In real-world use, the HD25s are among the toughest headphones around. Just my two cents.
 
But yes, they look cheap. The design is decades old, but hey, if it ain't broke, why fix it?

Click to expand...

Sennheiser, for the most part, is bizarre...their products seem horribly cheap and flimsy with crappy plastic but are the most durable things ever.  When I bought my HD428 I was sure these things would die soon...but nope.
 

Quote:

hughkk said:

how would u compare this to an amped SRH840?? i use a audinst rig, which is a dac/amp combo, but a cheap one.
 
can someone with both tel me the difference between them??
thaks

Click to expand...

My srh840 amped is smoother and flatter then the hd 25 1 ii. It's nowhere near as fun.

morbidtoaster said:

Get the regular pair and slap some aftermarket velour pad sets on them. Better comfort and whatever looks you want (color wise of course).

 

Click to expand...

no. my second pair had velour pads (well, my friends' pair ). Still not the best comfort (but a bit less sweaty and yes you can get different colors I think)


>But adidas branding makes me feel like a tool when going out.

ditto.


as pointed out, the plastic is very durable (the very used pairs I had, only had slight wear on the sliders, but that was about it)

I own the Sennheiser 428 HD cans, they are light and do Blackberry 8220 Flip really well. Sorry to
interfere in the thread. Mid-Fi is all I do.

Quote:

morbidtoaster said:

Or a V Moda M80...or AIAIAI TMA-1. Both of those have a similar signature and are very well built.
 


 
 

Click to expand...

that brings me to the age old question, 
to get tma-1 or hd25??
 
i like listening to club music, mostly (like david guetta type)

Quote:

audioal said:

I own the Sennheiser 428 HD cans, they are light and do Blackberry 8220 Flip really well. Sorry to
interfere in the thread. Mid-Fi is all I do.

Click to expand...

Thats low fi.

Quote:

enter darkness said:

My srh840 amped is smoother and flatter then the hd 25 1 ii. It's nowhere near as fun.

Click to expand...

This, plus their ability to take use & abuse, is what makes HD25's the ultimate portable beaters IMO.  I have two signifcantly better sounding portables (DT1350 and ESW9) but my HD25's still get their share of burn.

Quote:

il mostro said:

This, plus their ability to take use & abuse, is what makes HD25's the ultimate portable beaters IMO.  I have two signifcantly better sounding portables (DT1350 and ESW9) but my HD25's still get their share of burn.

Click to expand...

how would u describe the sound witth hs25 and dt1350??