I wanted to let you all know that I too took the plunge and installed 4.5.0.33 on my 8330. I've searched for an hour and its impossible to find the current .45 beta build, but wait!

-None of the ringers work. they are marked as extension aac and if you try to play them in the media application it says they are unsupported media types. Guess a framework didn't make it into this beta.

-SLOW. Answering a call takes 1-2 seconds to answer the call.

-3rd party apps that I had worked as expected including VZNav

-Blackberry freezes every time i connect it to BlackBerry Desktop Manager. USB Disk mode works just fine.

-HTML email works with BES hacked on SP5

-Browser buggy, no improvements over 4.3, had to disable the mouse mode to make it usable at all. The new built in search is nice...

-I stream Sirius through Orb. Once I get it streaming I like to do other things on my phone. On 4.5, switching out of browser ends the streaming and I loose my Sat Radio...last straw! Back to 4.3 (and I've beta tested everything I own)