I have 2 X5's both with newer Android units (Xtrons). One is the 10 inch screen with no button, and the other is the the 7 inch with buttons, which I bought after I installed the 10 inch no button unit.

Both are working fine with the reception of poor radio reception and poor phone quality. but I prefer the unit with the buttons. I only use it for blue-tooth music and occasional phone calls.

you might think how you intend to use it. If you were going to use the screen more for navigation or movies, or whatever, you might opt for the big screen