I run the 4x4 Labs on my FJ 40.5 rig. I am very happy with it for the same reasons Woody mentioned.
X2
Mine works great...had a little problem with clearence on the frame and spring. But sent them back to luke for some tweaking and all was good. Still hits my frame on a hard bump but thats because my soa is really mild (short spring hangers and shackles) and my springs are perfectly flat on level ground. I just need to adjust the bump stops and shackle lengths.
