Nothing but issues with my sensation since the update from three. I know have duplicate three apps on the phone, which seem to run all the time, the phone reboots if you update or download an app from the market, the brightness issue is there, it will change the brightness from auto to full for no reason at all, and in connection with the reboot after app update, battery is worse, which I thought would be hard to do as it was useless before the update. Many other issues to do with it being slower than before, using up more memory for no reason at all, other than there seems to be more three crap on it now, also having issues with the alarm not going off, only thing I can see is fixed, is the app icons not changing to default android after reboot.
All in all, complete waste of time updating, has turned a crap phone into amazingly an even worse phone, well done three and htc after many htc phones, looks like my next phone will not be htc or branded.