I've seen the Rock Crawler version on a friends Jeep and it flexes like crazy, rides nice (although he is using the cab controlled rs9000 shocks), and has given him no trouble whatsoever.
For a short arm kit, and the price range it is in, I would consider it a good choice FWIW.
Gone but not forgotten:
05 TJ Sport
RK 5.5" Long Arm, 1" Daystar BL
M.O.R.E. Bombproof 1" MML
AA SYE, RE CV Driveshaft
4.56's, ARB Super 30 Front, Detroit D44 w/Alloys Rear
35" BFG MT's
RK X-Factor steering, Currie Anti-Rock,
Nth oil pan skid, Rock Crusher Diff covers
OBA (Viair 450c System)
Trail Gear Rockers
Custom rear bumper/swing out