1) The machine is bulky and not adaptable, as saying that if you do not have sufficiently large hands, the wrist position is uncomfortable after a few hours and your fingers easily reach the top row of keys.
2) The mini joystick (thumbstick) is too small and poorly made, in the heat of the moment that it escapes you regularly taking his "thumb" is inadequate which will take you to do as a lot of gamers ... replace with a thumbstick XBox 360 with hollow anti-slip studs. Here and there by walking against thunder.
Otherwise you will be sentenced to only use it in order to assign keyboard shortcuts and forget for travel, strafe ....
3) last point, not bothersome but useless. If you have a Logitech G510 keyboard guy with the one screen and the G13 will bring nothing more else ... see you the same as the keyboard!
Otherwise, the G13 is still a good product that will give you an advantage especially in pvp, but you really rethink this joystick and adaptable or make the wrist rest for small hands.