Hi Nathan
Welcome to the forum, others will better advise regarding your Mac question but all the years i have been on the forum i can't remember anyone using a mac. a lot use Mach3 and that is windows based, also Linux is a popular system.
Regarding cheap Chinese machines, they may look OK on youtube but they do tend to be not well built and nasty electronics.
Do you have an intended use for the machine or are you just getting a feel for CNC, the thing is once you get your head round it and you realise what is possible a Chinese machine is going to disapoint.
Also need to know what your intending to cut, your working area and your budget.
Enjoy the Forum there's a wealth of information available on this site and the guys are extreemly helpfull.
Regards
Mike