ok so i've been playing games for around 90 mins constant and they were:
Draw something
Flick Golf
Osmos HD
Temple Run
I've also had a browse on the net and watched a couple of youtube HQ streams on the next CoD effort B.O.2 and the battery is showing 75% Discharging with 5hrs 51m on battery this being in and out of standby.
So to be honest it seems no worse than the original FW out of the box.
Happy Days
Edit - What i meant to say along with the results is that the on screen keyboard hangs for a while on draw something but other apps seem ok (facebook and twitter) it was ok on the original FW? Has anyone else found this or even plays draw something lol
Update - Still running well on the same charge, tho i had to download adobe flash player 11 to play anything on BBC Iplayer, i was a little concerned after reading some posts about it causing issues but it's playing 'Lee Nelsons Well Good Show' a treat at the moment with no lag or lip sinc issues.