I have a WOZ RR with the 7.5V buffered light boards. I have never had an issue, and the game plays great....these are pinball machines, and sometimes things fail, but the 7.5V boards are perfectly fine, and very few fail....if you have a chance to get a decent deal on a HUO game just make sure it has the 7.5V or the 2.0 system is place...