if you give a listen to the various G3 cd's, you can pick joe out from the all star jams just about every time. That kind of distinctive styling is anything but sterile imo. his playing on red house or my guitar wants to kill your mama on the first one is killer.
the Professor Satch cd is anything but sterile.
more funky than satch surf imo, but he is having fun with it. Kind of like issaac hays meets satch on the title track and a few others.
like dan said, not like the extremist, but that was his break away from stu hamm and campatelli and his hook up with the bissonette brothers. took a nice left turn and got back to some killer straight ahead rock playing.
he did bring bissonette back to play bass on the last one, but I dont hear the influence as heavy. I think he really needs his brother playing with him to sound his best.