Not using one....yet.
I converted my MacBook Air into an astro rig via boot camp, I just remote into it from from ipad or some other laptop/PC. If I could integrate it with everything without needing windows I would have just kept it running OSX natively. I'm too reliant on ASCOM bus integration with TSX pro.
Will likely get the next mac mini as it's nearing a hardware update. That said, it's an impressive piece of kit, hardware stable and just works. Nice little mini should fit quite nicely in an observatory once I figure out what I'll drop down out in the backyard.
