Since nobody else replied.
I just replaced a guys rcx 2.5 with a better lift of the same height for the following reasons.
Bad body roll
Springs sagging under the weight of front and rear bumpers
He claimed the Tires (35's) hit the fenders when going over bumps.
All four shocks were blown out from daily street driving, the jeep had never been off road, one was so bad that you could hold it up and the weight of the shock body would cause the shock to expand and collapse with no resistance.
He is happy with the better brand, which actually sits a little higher. We tested the springs before the swap and were able to create enough rock in the jeep to bottom out the front by pushing down on the front with body weight.
That is my experience with this lift. Most of there stuff rides really rough until it breaks or wears out, then it may as well not even be there. I guess that makes diagnosis easy though.