Wyrover:
I get this question all the time. I can tell you that many users have commented on how much they like the ride and performance with the 2.5" lift. Some even prefer it over the stock mode. Recent forum comments from Johnson Rod users:
"Have been driving like this for almost a year now and all is well, and the ride is unbelievably smooth"
"My passengers always expect the LR4 to ride like a Conestoga wagon based on the lift and tires, but it retains that amazing Land Rover air suspension ride quality, even better than the factory setup"
I have customers using Johnson Rods for over five years and they are still very happy. When they upgrade to a new model, they always reorder another set. Sad to say however that the new Range Rover L405 and Sport L494 can only get 1.5 inches and still maintain a smooth ride.
http://johnsonrods.com