i had a tab 7.7 for a year. loved it. i think it's the ideal form factor/size. amoled was great for watching movies. i had it rooted as well.
but at the end of the day, i wanted naked android. no more skins on top of it so i sold it to get the nexus 7, even though it was smaller. at the end of the day i think 7.7" is perfect but 7" works just fine for my needs.