I have the pro comp lift on my Jeep as we speak. I have wheeled it on some moderate trails with no problems. The ride was fine. I will add that I have Fox reservoir shocks, so that helps a bunch. I added Rock Hard front and rear bumper with a winch and swing out tire carrier and didn't notice any sag in the springs.
I'm new to off roading and thought the lift was fine until I rode with a buddy of mine and his Currie lift. The difference was night and day. Since I plan on more challenging trails, I upgraded to the Savvy/Currie 4" lift. That will be installed next week, along with the Savvy Under Armor and outboarding the rear shocks.
I think it depends on how you plan on wheeling it. The Pro-Comp was fine for the moderate trails I ran and I probably would have stuck with it had I not seen how nice the Currie lift was.