Here's my story about the UE900 cable.
After initially purchasing the Shure iPhone cable, I immediately returned it. EarphoneSolutions accepted the return, good service from them. As many people have commented, the Shure iPhone cable is terrible. I found it poorly constructed, and the remote/mic was bulky and prone to snagging on my shirt collar. And $50? Total rip off.
The UE900 cable is much better in all ways. It's a pretty funky bright blue, but nicely designed anyway and goes well with my black SE215s. The remote/mic module is lightweight and well-positioned. Much like it should be I think. The connector is a right-angle style but I think lacks a little bit of strain relief, and I'm a bit worried about its durability. So far so good, and the price is right anyway, so I don't mind replacing it if it dies in 6 months.
(I have a Chicago winter to look forward to, and my daily train commute is apparently very tough on headphones and cables...)
Anyway one thing I should say is that the UE900 cable does NOT like sweat! For a while I used the SE215+UE cable combination at the gym, and noticed that after a 30+ minute workout the buttons would stop working. After drying out, they'd start working again. I did this a few times and of course inevitably did some damage - as of right now the volume buttons no longer work (although the play/pause button does).
After buying some separate gym headphones (Senn OCX685i, very nice so far) I can live with this mostly functioning cable - and I'm going to wait to see how they survive the winter.
tl/dr - UE900 cables good, but keep them out of the gym!
great, thanks for the feedback. i want to get one for general listening and not for the gym. did it change the SS at all?