There are only 3 IDE Raid chipset makers. Highpoint, Promise, and CMD. IWill, Abit, Epox and many others use the Highpoint 370. MSI and others uses Promise. AMI uses CMD which is found on IWill motherboards and in CompUSA controllers.
I don't believe there is anything wrong with the controller card seperate from the motherboard. It's when they integrate it into the motherboard where people are having problems.
The Promise controllers have a higher CPU usage than the Highpoint controllers.