I can say after about a week of use that the 2.1 released by Sprint is pretty much garbage. It's no where near as stable as 1.5 was, and now faced with constant program crashes with the email app which is the one I need on the phone most (because of work).
I've tried every possible fix out there for the force close issue with the email program and nothing works. Also noticed since the day it was updated that it no longer pulls emails consistantly. Sometimes it takes powering it off and back on to get it to finally decide to download emails.
That coupled with a slew of other glitches it never had, I'm working on switching back to the 1.5 release as we speak.
Not everyone hates it... just my two cents in case anyone is considering update and can't function with out email working spot on.