EVE launched their Mac client late last year. I used to play EVE on the PC years ago and I started up again a few months ago on the Mac client. I'll be honest, the client is not stable. I get, on average, a crash every 40 to 50 minutes. The graphics are fine and the game runs smooth enough, but the crashes are VERY annoying. At first I was dealing with it fine but after a while it was getting frustrating since I was too afraid to mine in low sector areas as I'd crash.
They are working on the Mac client, but overall it's not too bad if you can deal with the crashes.