The only thing I know about them is that they have flat seats on their leaf springs (like old man emu springs). This is supposed to give better flex and ride because it does not fight the springs arch as much to compress. I seriously considered that kit for my YJ, but couldn't find any reveiws at all and didn't want to be the ginny pig. I have however since read great reviews about their coil over conversion lift, but that's a completely different type of suspension. Good Luck.
TC