I've been on Android for a couple of years now and just got the Galaxy SII.
It doesn't exactly feel wrong, but sure as hell it doesn't feel right, either. Everything I do on Android seems to take about two or three steps more than it should. Some things just don't work. Some things just aren't possible. I can't find certain software that I need. The worst thing, it's missing fit and polish half the time.
This is the least comfortable I've ever been with a tech purchase. Hopefully, T-Mobile gets bought out and then I can play the get out of contract free card and get an iPhone.