Yeah they are amazing but the only ones that run remotely as intended currently are like Ibara/Ibara Kuro/Pink Sweets. There's massive amounts of slowdown missing in the other games that makes them actually survivable on the arcade boards. Basically a large percentage of the games should be running at literally half the speed they run at in mame so a lot of the enemy patterns you run into were designed to be dodged at half the speed you are seeing (in current mame) and trying at double speed is near impossible/game ruining.