Been living with the F806 for a bit over a day now. It's strange going to an Android device (my first one) from the X1060. I can't quite get through the menus as quickly or naturally as on the X (by nature it's much simpler there). I need to spend some more time to get totally familiar with it before I get more in depth with my observations... But I will say sonically it's definitely an improvement, mainly being more spacious sounding, and having perhaps a touch more sparkle and life in the highs. Everywhere else it sounds pretty much akin to the X. But just those two minor differences combine to help hear deeper into recordings, which is nice. Makes me wish I could hear the Z now to see if it's identical to that S-master MX brethren. Battery life is appallingly bad unless you listen while in airplane mode, and leave it alone without fiddling/activating the screen. I'll be shocked if I ever get anywhere near the claimed 36 hours for music playback.
I find I like poweramp over the stock player, and like the flexibility that Android gives for this purpose.
Sort of looks like the monolith from 2001 Space Odyssey...