Got the update this morning before I left for work. Took about 5-7 minutes total with download, install, and reboot.
I've only had the phone for a few days, but I can already tell a difference ( battery and performance ).
I have not run the Advanced Task Killer after the reboot, so all the default services ( startups too ) are running...and there are plenty. Why do I have two last.fm processes by the way?
Battery still full green. Whereas before, after about 3 hours of moderate use, it would have shaved about two bars worth battery off.
I'm very, very happy with this phone now. Having a carrier/manufacturer provide updates that result in noticeable improvements is a huge plus in my book coming from ATT ( iPhone 3G and Samsung Eternity ).
I liked my iPhone 3G when I had it, but I felt "locked in" to Apple's way of doing things with the phone. And Samsung nver sent out updates. Apple req'd you use iTunes for updates.
Apps are cool, but I want to tweak the phone ( without 3rd party tools/hacks ) the way I like it and the stock Eris let's me do that and I get some really cool apps to boot.
Just can't say enough good things about this phone.