Thumb control of analogue joystick is very nice, and the front buttons are easy to press. Very usable as a mouse replacement, or for presentations. - just need to hack our devices' X11 server to accept this for that purpose.

The other two buttons are poorly placed and not usable for any application where you need to hit them frequently. The natural position for 2nd and 3rd finger has no buttons (see pic).



Conclusion: Not usable for games requiring > 2 buttons.