Got my I-Pac today. This little piece of techonology is well worth the bucks. I have it wired into my prototype CP and it's working fine. I have a couple buttons not working, but that's probably due to a wiring problem. This thing is great.
For anyone interested, I originally built my CP using a hacked keyboard controller. I used an old Gateway 2000 PS2 controller. For shooting, this was fine. However, for fighting it was frustrating. You couldn't get accurate keypresses when pressing more than three at a time.
Anyway, I figured if anyone was still trying to figure out which way to go, this is one more vote for the IPac.
Happy Gaming.