Got my SE215s a couple days ago, and here are some quick impressions:
They have a pretty wide soundstage, quite a lot of bass (comparable to Panasonic HJE900 imo), although sometimes the bass can be a bit sloppy and slow. Mids are good and present, treble is nothing to write home about and seems to be somewhat subdued, especially compared to my CK10s. It seems pretty laidback compared to other IEMs that I own (HJE900, CK10s). I think these may require more burn in before I make a final decision, but I do like the sound signature, it is fun, albeit not super detailed. The housing feels solid, although I am somewhat concerned about the nozzle, since it is pretty thin and it feels like I might break it when I remove tips. Wiring is solid but it is too stiff and while I like the 90* plug, it's too big. To give you an idea, the part that goes into the jack has the same circumference as the 3.5mm jack on my audio technica M50s, which is a full sized headphone with a screw on 1/4 inch plug.
I own/owned 5 different pairs of IEMs and so far these SE215s are the best at isolating (comparing with CK10s, HJE900, MEE M6). I guess if I were to rate the isolation of the 5 IEMs it would be:
SE215 : 4.5 - very good, almost like foam earplugs. Medium olives.
CK10: 4.25 - also very good, but since I use silicone tips, iso isn't as good as the shure olives. I can get these pretty far in my ear due to how small they are. Using stock small tips (imo, sound better then hybrids)
MEE M6: 3.5 - decent isolation, but not as good as the previous 2. Using medium sony hybrid tips
JVC HA-FXC50 - 3.5 - hard to get a good fit but decent isolation once done.
HJE900: 3.0 - mediocre isolation, imo, but maybe I just can't get the right fit or don't have the correct tips. Currently using some double flange tips I bought off ebay, since they sound the best with those from what I have tried.
Pros:
- Large wide soundstage
- great isolation, best out of everything I have owned so far
- good sound for $85-100
- removable cables
- built quite well.
- decent bass quantity with an "oomph"
- good mids
Cons
- cable is too stiff and l-plug too big
- bass can get sloppy
- trebles don't stand out
- not the most detailed IEM (maybe burn in will help)
Overall, I would have to say my CK10s still sound better to me by a decent margin, and remain my favorites. However, I will most likely be keeping the 215s since they are fun, they isolate well, and they are built pretty damn well. They are slightly less detailed then the HJE900s, but the soundstage is quite a bit larger, imo.
EDIT:
Btw, how do I create/have a signature show in my posts?