While I greatly enjoy the GB update, there are a few negative aspects I wanted to point out (that may be specific to my phone, but just wanted to throw it out there):
1. Since the update, when plugging it into the dock, it doesn't always go into "multimedia mode," even tho the notification bar says it's connected to the dock. I even pull the drop bar down and select it... it doesn't do anything. I have to unplug and replug several times before it works. Kind of aggravating.
2. Handcent seems to be a little wonky now. It will sometimes not notify me of new text messages, either through a blinking LED or the screen turning on and a popup appearing. I sometimes will not know I have new messages until I turn the screen on and open the Handcent app. I've also noticed a significant increase in sent and received "double" "triple" and one time a friend asked why I messaged the same message 7 times!
3. A lot of people seem to have improved battery life. I feel like mine is almost the opposite. For example, I moved yesterday to a new apartment from the Los Feliz area of Los Angeles to the Brentwood area of Los Angeles. I took the phone off the charger at 12PM and my phone died at 9:15PM. With all the moving I did, I didn't heavily use my phone. 45% of the battery use was the Phone Idle section. The other majority was the display (obviously).
Again, the GB is really speedy and great, but my particular phone has been having those issues listed above.