I put it on my 8900 and it seems alright but have had several issues with it:
Cons:
1. My DNS doesnt refresh. Often wont be able to connect to internet and have to go in and flush the DNS
2. Keys seem touchy; menu key will sometimes skip opening the menu and go to the app-switching menu. Often when I text I strike a key and it puts a . and capitalizes the next letter. Doesnt do that with other OS versions and no, its not my phone...
3. Some 3rd party apps, like quickpull, doesn't play well with it.
4. Often won't pick up EDGE and I get stuck with edge until I reboot.
Pros:
1. Boots fast :Eyecrazy:
2. Cool new features but also same ones available in .348
3. Like the texting feature
4. Do like the picture sending feature. And this one sends photos much better than 348 did.
Theres some more that I cant recall right now. But I am about to wipe and revert back to 348, I had no issues with that one.