With a trip to Vancouver coming up, I didn't have any decent traveling earphones. The best thing I had was a pair of closed-back Shure SRH440s, but they don't isolate well enough to really cut down on airplane noise. Meanwhile, the Shure SE215s were on sale, so I decided to try my first IEM.   Before I pulled the trigger, I wondered if I should just step up to the flagship SE535s. I have some nice headphones already, and budget headphones can be disappointing. But then I thought, what if I find Shure IEMs uncomfortable? My local Shure dealer does...