The 3 in 1 Magic Joy Box was used on Mac OSX Lion, with a GameCube Controller, it worked great without any driver install. I used the binary version of Dolphin which worked a treat. I've not had any problems with 3 in 1 MJBox. Strongly recommend if you love playing GameCube games. Most surprising thing was it worked ok on the MAC OSX Lion without drivers, although a CD does come the device. The only other thing I would advise is ensure you have the correct mapping of GameCube Controller, I made a ash of my config file the first time, because I couldn't remember the button mappings, trial and error and it was sorted in few minutes, I looked up the mappings on the internet.
Thanks
Kevin