I had them. They rode well and flexed great. Mine sagged about an inch and a half after two years over hard wheeling but they have a lifetime warranty that covers sag. Took them back to Four Wheel Parts and picked up a new set for free. About two years later those had sagged again and got some new ones again. This time I stumbled upon a deal to good to pass up on some Deaver springs so I sold my new Superlift.
'91 YJ 4.O, Auto, Rr. D60 w/ 35 Spline Alloy USA Axles & Detriot Locker, Fr. D30 True-Trac, 4.56's, 4.5" Deaver Springs, Bilstein 5100's, 1" BL, Rubi Flares, 35x12.50 MT/R's on MT classic II's, Detroit Locker, Vanco Big Brakes, Booster & Master, Warn 9000XDI, York OBA, AA SYE & TW's DS's, Teraflex Belly Up, Rocker Guards...