I have the Chrome Orb on two computers, both Abit KT7's. Yes, the Chrome Orb does fit and does work. Granted, it is a tight squeeze and you will be have to VERY carefully nudge some capicitors outta the way, but it fits and works. I have even taken it on and off (had a loony idea of soldering the L1 bridges...not wise...).
As for the cooling capabilities, I am very happy. It might not be the absolute best out there, but I can run my 700 TBird at 850 without a problem. I also o/c'd an 800 to 880 which is 30 more than I could get with a cooloermaster rig.
I have multiple web windows open, mail and have been working in Frontpage all morening, my cpu is at 33c, M/B is at 26c. Works for me! I do have additional fans in the case, including a blowhole.
You have to look at what you are planning on doing, what your room temperature normally is and how much you want to spend. I enjoyed Anands article on cooling and found it useful. I also have found that this $17 orb does everything I want, need and desire.
Cheers
Greg