HI Tony,
I read the review in the amazon link you gave me. Actually I'm little bit confused with it. I prepared a little video on the performance of my tab 7.7.
There's no lag between screen (although I admit that when I rotate it, the icons took some time to appear).
I also do some test on the front camera by wiggling my finger. For me the delay is quite reasonable for a front camera. You won't take picture with it anyway.
Then I do test on the volume button. The up is up, and the down is down, unlike what the reviewer said.
All in all, I'm very happy with my tab 7.7.
here's the link:
http://youtu.be/KaXuH9PvD7g
Cheers!