Well, if the apps button is too far from media or utility menu it could become a little bit hard to use loading it with macros.
I would expect to see rewind and fast forward buttons enabled in the media menu, now they are greyed/disabled.
Concerning EXIT and BACK button, just to explain it better, now the EXIT button of this keyset behaves like EXIT and while browsing submenus it could be used to exit everything and return to the tv channel.
If i can say my opinion, from the usage perspective, i feel the "guide" and the "zoom" buttons in the wrong place and i would expect to find them in utility tab since they are standalone functions.