I have not managed to get Macminer or Asteroid working on my MacPro, it maybe because I am running 10.7.4, or I dont have the correct libraries etc.
I have spent a lot of time trying, and finally gave up.
Cgminer works well, also Diablo and Bfgminer.
I must agree with the statements about the Mac being a nicer/faster OS to use, I have been a PC/MAC tech for many many years, didnt like the Mac much until the processors changed over to Intel. I was always a fan of Linux/RISC OS due to being a network administrator on RS mini's (showing my age now).
The Mac is like a breath of fresh air compared to the pc.
They both have their advantages, but you can't run your PC as a Mac when you need to

Phil