Welpers, I installed them and played on them last night and all I can say is WOW! They play amazingly. I was concerned at first because i've heard other people say they don't like them because you can't feel the "corners".. Let me tell you, that if you've ever had experience with fighting games, this is no problem at all with the p360's.
Also, to anyone who's interested, I got my 5v and gnd from the I-PAC, which worked fine. I used an old dual pronged lead from a motherboard LED light or power switch, etc. and used one lead for each joystick, so I didnt have to try and solder wires to those little leads on the I-PAC.