I've flashed this, with out root (Don't need it). Everything is pretty solid. There's a 5th metal skin i've seen included with the incredible S, The Get more htc widgets works, quadrant gives me a 1510 or so.
Anyone who has experienced the 'input lag', where typing to fast will cause the phone to lock up for a sec then spit out the text, should know that gingerbread fixes that.
The only issue I've seen so far is the vzw app crashes constantly if you update it. If you don't update it, it's fine, but you can't access usage info.
This is 2.3.3, so it doesn't have the updated Gtalk video chat, If you root, there should be a way to install it.