Quoted from woody24:
Only issue I've ever seen, is on my iPad I've had the ball shoot out of the back left of the cabinet a few times. But haven't had it happen for over a year now, so they probably fixed that.
Balls go all over the place on my iPad. The worst is when you barely make a ramp shot, I frequently have balls fall through ramps or through the bottom of the table. I don't think I play a ton of TPA but just about every time I sit down and play for a half hour something weird will happen on some table.