I use the j-stick. Note: If you go the j-stick route, it can fit in a 3/4 mdf without routing, but it isn't very tall. It's about the same height as a real Ms Pac stick mounted in the metal (ie: the ball is low).
IMO the j-stick is great. The only drawback is that it is very loose action. In other words, you don't need to push very hard to get it to move in a direction. So, function is flawless, but feel is still different than an authentic leaf sw 4 way joystick