I rooted my stock 1.1 - and being familiar with 2.1 from my wife's Fascinate, I have to say I'm not liking it. I know some things I just have to research and figure out, but the glaring ones include:
Softkey: I haven't figured out the difference between softkey, and the back/menu buttons that show up in the bottom status bar. Are these the same/different??
Launchers: I briefly tried Launcher Pro (which I put on my wife's phone) as well as Zeam. I'm unable to create any shortcuts with either - no idea why yet. I really need a launcher, as the Nook layout totally bothers me.
And lastly - won't affect most, but I need to install Lotus Notes Traveler to gain access to my corporate email/calendar. It basically enforces screen lock, and supports remote wipe. It doesn't play nice with my 2.1 Autonooter root, so I'm likely going to try Froyo.