Currently playing on an imac or Macbook Pro with bootcamp. I play Guildwars on both platforms. I prefer playing Guildwars on Windows as that seems to be the smoothest. Guildwars on OSX seems fine, although the latest update does seem to be slightly laggy when running across the map (it seems to run fine for a bit and then slightly pauses as it seems to catch up). Its fine in combat, you may want to turn your mouse sensitivity down