I have never used any of the RRS gear, but I have heard great things about them. If/when I do switch ball heads, I plan on going with RRS, and the Arca Swiss style quick release system. The price is the biggest drawback for me, but I think it's a really great system. I like the idea of being able to switch from horizontal to vertical without having to totally loose my camera position like I do with my current system. I currently have a Bogen/Manfroto 488RC2 ball head and quick release system. It works pretty good, and the QR plates are pretty inexpensive so you can put them on every lens and camera body without breaking the bank.

Like anything else with photography, you get what you pay for.