I have the Superlift 4" and for the price it's a great lift. I've done some upgrading though, swapped out the cam bolts for the Rockrunner fron lowers (coincedently, it's in the shop today to get the rest done).
I did replace my front drive shaft, the auto with a lift causes the boot to tear.
I'm happy with mine, my only regret is i didn't get a lift I could upgrade and go bigger on ie Teraflex