Hey!

As far as I know JJ2 runs pretty well on OS X via Wine, and JJ2+ mostly works as well. You can find more information about Wine here. Of the options mentioned on that page I've only used WineBottler, which worked well enough for me.

I don't play regularly any more, but it's always been fun enough. Lag is a factor like in any multiplayer game, but generally speaking the game is very playable online. Don't forget the JJ2+ patch though, it improves the game a lot and many servers require you to have it installed.