Just wanted to share my opinion that the avid bb5 disc brakes that came on my 06' hardrock pro are the best brakes I have had. WHile the hayes nine hydraulics I used to have had greater stopping power, they always rubbed and always needed adjusting.
My avids were rubbing just a tad bit, all I had to do is reach down and twise the red knob, no tools required, just my fingers. fixed the problem right up. also you can control the clearance gap really easily both ways and now I have my levers and clearance set perfect for me.
I just wanted to share that Avid is A+ in my book.
-Also, compared to shimano, I love the sram components. I have a x7 rear derailer and xgen up front, and couldn't be more happier with their flawless performance. Maybe in the future I will upgrade to x0s, but for now I love everything about my bike.