The Nvidea Shield is a really nice and powerful device. So the device is $250 and power-wise puts all other handhelds to shame. It is android based so it is useful as use like a tablet and has all the great free and paid emulators in play store. N64 and PSX emulation are a cakewalk for this device and the controls are near PS3 level. MAME .139 Runs amazingly. Almost every thing is full speed. .139 is a fairly recent version of MAME. The battery life is amazing at about 10 hrs and the screen is gorgeous. The thing is kinda big but it is like the Mercedes of handhelds. The thing feels like high quality in my hands. None of that cheap plastic feeling of a cheap Chinese junky handheld.