I have built three of these as DIY, they work great and are dirt cheap( the pre-built ones are cheap, but the kits? are for pennies, especially given the price of the competition.) If you are building one your self be sure to get the card with the magnetometer. The guy who produces these has some great videos on how to set it up correctly for games like Arma. If it is jerky ,snappy or laggy in game , its not set up correctly... I'll try and find the video link...