Nice IEMs for the price. I got these on a whim, to switch it up between them and my HD25s when I'm on the move. There is absolutely no way these are for bass lovers, mind you. They have less bass than the HD25, don't extend as low, plus they're not boomy. Quite nice IMO, as I absolutely hate overdone bass. The mids are quite forward and treble extension is very good, even though they're not very detailed and can seem lifeless at times. Soundstage is ok, but there's not very much layering, if you're into that sort of thing. Overall, they do sound nice for $35. Isolation isn't really that good, since they're ported, but they do OK on buses. To my surprise, they isolate less than the HD25 (yay Sennheisers!).

If you like your music player to have buttons and a screen, you know what I mean. This baby is solid bang for buck and there's quite a bit of bang in a small package. Great SQ, great design IMO and the microSD slot make the Clip+ awesome.

The HD25s are a legend, really, so I'll just say I love the sound. They push all my aural buttons, with a fast, agressive sound (not quite Grado-like as some would say), punchy bass and great detail. I feel these things just "throw" the music at you, making you listen. Don't know how some people could call them boring, really. They have a solid bass, a dip in the midrange which gives them a certain natural feeling, free of colorations, and somewhat sharp treble. Nothing is overdone, nothing is missing. Soundstage and neutrality might be questionable to some, the design certainly is, but these cans are something you really have to try, especially for rock, metal or rap.

 
 
 

I've had these almost two years ago for a few months and enjoyed them quite a bit, but just couldn't get over the problems that had (besides being open and offering no isolation at all; my mistake here). The sound is good, good detail, smooth highs, without much sparkle, but the mids were too weak for my liking and the bass.. well, it was a big disapointment. Maybe if amped properly they'd sound better, I don't know nor do I care much, given that these are supposed to be easy to drive compact portable cans, not on the same level as real mid-fi or hi-fi cans. The bass was just flabby and boomy, not what you'd expect from nice open cans like these. Too bad, because they did a few things right soundwise (lovely instrument layering comes to mind) and were the most comfortable things I've ever put on my ears: light and with no clamping force.

I'm almost tempted to buy these again and try them with my new sources..

The PX200-II are a nice little set of portable cans, maybe the best Sennheiser has out right now in their budget lineup. Amazingly enough, the Headroom frequency graph does not lie: the general sound signature is the same as in the venerable HD25-1, with a bit of treble roll-off.
 
I really enjoyed these cans while I had them. The sound is smooth, with restrained and very fast bass, once you get the earcups in the right position. Some people might find the bass quantity lacking, but there's no doubt about the quality. The mids are upfront and very energetic, which, coupled with a fairly tight bass, might put some people off, as the overall sound can be dry and a bit cold. Detail retrieval and presentation are just ok, nothing exceptional. On some tracks they can sound a bit boxy or congested. Highs are a bit too recessed for my taste, or just not detailed enough, as every cymbal note on these sounded the same to me.
 
Build quality is very good, these things are ment to last quite a bit. The only problem could be the cable, especially at the strain reliefs and the volume control - quite an annoying feature, actually, because you have to clip it to something at all times. If not, the cable will drag the left earcup down quite a bit.
 
Comfort is very good: the earcups barely cover half your ear, and the clamping force is just right to keep them on your head without it becoming bothersome. Even in summer, these can be worn with minimal discomfort.
 
Isolation is ok, but I didn't really think it was enough for loud buses or the subway. It might be good for walking or jogging, but you will hear what's going on around you more than you'd want to, even with music playing.
 
Overall, I'd say this is a good alternative if you've ever wanted the HD25 and cannot afford it just yet. Bassheads, stay away from this one.