I was wondering the same thing. There is one guy over at the Traxxas forum that says Integy suspension is junk. It seems that guy has a total UE truck. Those UE parts are very expensive. Either he has so much money he doesnt know what to do with or he works for UE. My guess is he works there. Anyway here is a thread that Mike just anwered the other day about the 2 suspensions. I trust what Mike says. He never steered me wrong yet.
G3 Race Suspension vs. Integy Suspenion