I have upgraded my 8310 on the Rogers network. Only glitch so far is with the video recorder.

I am running the latest 4.5.0.52 release on my 8310 and the video does not work on this release or on previous 4.5 releases. It allows me to record but does not save the video nor allow me to play it back.

I can't even close the application without pulling the battery on the Berry.

Other than that the upgrade went well. Just don't forget to delete the vendor.xml file after the upgrade install on your PC (and before you connect your Berry).