Does anyone have this game on the Mac?. I want to know if it runs okay.

Also is the GB server active, and are there people willing to show me the ropes if I buy this game?

I don't know anything about the GB server but I can tell you the game runs fine on Mac.

Yeah, it runs great on my Mac, I have a 2011 iMac. As for showing ropes, as of right now there aren't that many ropes to show. I just watched the quicklook and spent a little time reading about the game. Been having a blast.

Right now it's basically no more than Terraria with spaceships, which isn't really a bad thing. It runs fine on my, I guess 2-3 year old iMac? Watch the quick look, maybe look up one of the wikis out there. If I were you I'd wait until the next patch goes live (which should be quite soon, I think), because it's going to wipe characters BUT they've said this is the last time they're going to need to do that.