Not to oversimplify, but you will be amazed - AMAZED - at how easy it is to hook up the IPAC. Man, I know zilch about electronics, but I got mine right on the first try.
Regarding switchable joysticks, I suppose it's a matter of preference...I have Ultimarc's T-stick plus sticks in mine, which are switchable from the top and I love them! So nice to not have to lift the panel top everytime!
At one point early on, however, I didn't have them put back together correctly (it was my fault, and it wasn't that hard a fix) and they would not switch from the top. At the time I wasn't sure what was wrong with them, so I just switched them from underneath...and I found that NOT to be that big a deal either.