I am now driving my first lifted TJ, so I am not very knowledgable on comparing my RC lift to others on the market. Obviously, Jerry is the man to listen to.
However, I am pleased with my 4" lift. Don't know about longevity yet, as it has only been on for 7 months.
That being said, I agree with JB that it is ROUGH. My girl will beat you to death on and off road. But I like the rough ride. Otherwise, I would have bought a Cadillac!
No problems with mine thus far, but I have been told by a fellow jeeper that changing out the shocks would help with the ride. I guess it depends on what you want to use it for and what your budget is.