So I've had my Tablet Z for just about a month and the only real complaint I have is the YouTube app video quality is pretty bad! What little setting adjustments there are don't do anything to help. It looks like my player is playing lo-res 480p video on an HD screen even when HD is highlighted as the play option.
Netflix, Sony Video player and inline/embedded videos all look great so I know it's specific to the YouTube player.
Hoping that the update that's due out this week will alleviate the problem, part of the update addresses the YouTube app. I didn't know that manufacturer's had their own versions of the Google core apps, learn something new everyday.