i used to have the Pro Comp 2.5" lift and i agree, there lifts are very stiff and not that good for flex. I have since changed to the Rubicon Express Extreme Duty 4.5" lift (they have an Extreme Duty 2.5" also) and the ride, on and off road is considerably better. It flexes extremely well too. I dont know about now, but the Pro Comp lifts when i bought it did not come with sway bar disconnects and you had to use your stock shackles. The RE's are a tad expensive, but well worth it. Just my 2 cents.
'92 Wrangler, 350ci Chevy w/ Holley Truck Avenger carb, B-W WC T4, NP231 w/ JB conversions SYE, Ford 8.8 rearend w/ ARB, Dana 44 front w/ ARB, 4.10's, Rubicon Express XD 4.5" lift, 35" MT/R's on 15"x8" American Racing wheels, 6" Bushwacker cut-out TJ-style fender flares, custom polished aluminum dash w/ full set of Autometer Ultra-Lite gauges, Warn HS9500i winch, Big Daddy Step Rock Rails, custom, self-made rear bumper