Not impressed.
I had previously been rooted and used ClockworkMod Recovery. Even after uninstalling all of the "extra" stuff that I had added and unrooting I still had to SBF to a previous version in order to get the Gingerbread update to install. I was hoping for something very much like the Droid 3, but it's a bit of a pale shadow of that UI, probably due to weaker hardware specs. Things that I have noticed immediately:
1. The update reset all of my data and battery settings to the defaults, which consume the maximum amount of bandwidth and battery. Seriously, my battery was down to 50% in only two hours. I fear for people who don't have unlimited data plans.
2. The 3G logo in the notification bar is blue and the up/down arrows are always lit. This appears to be the "background data" setting, which keeps the sync process going 24/7 and is presumably killing the battery. Disabling "background data" seemed to fix both issues.
3. The contacts are jacked up beyond all recognition. Instead of keeping just the contacts that I had, not I have contacts for everyone who I have ever interacted with on Facebook, Twitter, via email, etc, including a bunch of new dupes of previous contacts.
But hey, it feels snappier. Who knows if that's any good.