I installed the TBH rooted version (which is the same as the one at MDW) and have had zero issues so far. Gotta say - GB is slick. Fast, stable, and the improved transitions, blur widgets, and new notification bar are all really nice. Just downloaded and installed D2 Bootstrapper and Titanium and am restoring all system apps (w/data).
What I did when I first installed the Froyo OTA (2.2.340) was root, grab bootstrap and make a backup. I just flashed that (was weird to see all those blur widgets - ha), went back into recovery, wiped everything (battery stats, Dalvik, cache partition), did a factory reset, flashed the TBH rooted GB and it booted right up without a problem.
EDIT:
I also have this, but did a full wipe before flashing and skipped the sync when setting up. Anyone?
EDIT #2: I shouldn't have signed into the stock email at setup. Don't know what I was thinking - been on K-9 for months. It was polling my crap hotmail every 5 minutes. Problem solved.
EDIT #3: I went to work with Titanium, all apps restored w/data, switched home launcher to LP+ (the 3D app drawer was unstable, but I haven't run the latest update - 2D is fine), froze all bloat (although you can actually permanently delete now with that exploit, but I figured I'd keep it just in case), put all widgets back in. Everything seems to be okay. I love the new dialer - looks really nice. Of course, all this restoring, widgeting, installing, downloading, etc, wiped my battery completely out, but still - REALLY liking what I'm seeing so far here.