If you spend the time to research and get the parts that are supported by OS X, building a Hackintosh is breeze. I have had no problems with the one I built.
The best I had was a system which booted (incredibly slowly) and for which I could never get wifi working.
YMMV, but you have been warned. Even with good documentation, there is absolutely no guarantee you'll get anywhere at all.
Their recommended builds are excellent, even if you were only to use them for Windows.