I would say I get what I need.
I have the phone from 6:40am till 10pm with 20%-10% battery left.
My use is:
WIFI all the time.
3G (data transfer) off all the time.
Playing Angry Bird, Slice Fruit and a bit of Golf 3D and listening music while going and coming back from work (2hrs journey return).
And obviously making/receiving some phone calls.
Now, lately, I've been playing a LOT of Golf 3D (got really addicted
) so from my house to my work I've lost 30%-40% battery.
When I go to my break I play another 30 minutes and the battery is already on its 40%-30%.
So basically I have to charge it at work.
During the night the phone is ALWAYS charging so I don't know how much the phone would drain.