Well, right now Steven and I are hitting on all cylinders with the Mario Bros. doubles, regular play and NO POW. I hope it's this way on a arcade cabinet. MAMEHub has actually been very buggy and lagging at times but we are still doing OK. The problem with the arcade is there is a real chance it could have the same slow down bug when to much stuff is on the screen. Maybe the processor just can't handle it with a 2nd player? MAME emulates this the same way.
We managed to pull off the highest regular play doubles in the history of the game. I only say this as there is another claim of 1.1 doubles from way back in the day, which is hard to believe. Why? I know what it takes to get 1.1M and it's a total bitch! Anyway, we managed to get 1,287,510. We really do need to start recording our games but it just slows down the net-play so much.