My experience with this update has been good for the most part. After flashing my way back to stock, checking for root, then updating to 894, checking for root again I ran the 901 update. On the downside it worked my 4ever root so I'm stock 901 On the plus side no more data drops in 3G with no drops to 1X ( no 4G where I live yet ). Transitions from 3g to wifi and back have been practically seamless. My bionic seems faster than out if the box, oh and did I mention battery life? Battery life has been awesome, I've had this phone off the charger for just over 12 hours now and im barely under 50% with the extended battery and I've been all over this phone playing games, on the internet, a few phone calls, and Droid forums app and xda app and downloading stuff from the market. So minus the whole losing root and some extra bloat I am overall very pleased with 901. Just keep in mind, once you take the update there is no turning back the clock on your phone to previous builds at this point, it has been total disaster for those who attempted it
So be prepared to sit on this awhile if you do. Personally with my phone running like this I think I can handle it.
Sorry for the long winded post I just wanted to share my experience with the update.
Sent from my DROID BIONIC
After installing 901 update did you have to uninstall and re-insall superuser?