They are better as you said but it's almost per case and per hard drive.
FastATA can lead to nice headbanging and there are many cases that worked like a charm with nice boost and other cases that busted your b@lls.
I had that card and I was very happy, but on 2/3 HD's of mine couldn't go beyone PIO3 which suxed tonz. On the 1/3 HD it was working really cool... go figure.
It's a nice piece of hardware but very unstable imho.
Idefix Express on the other hand, it's not as fast but a lot more stable and works like charm on all environments.
