I have heard mixed reviews on the rough country ones. If you really need them I would spend the extra money for the Spidertrax ones as I have never heard anything negative about them. I picked mine up on Ebay for around $100 for all 4. I have had them for over a year with no problems even with me beating on the Jeep in Moab. Just remember that steel rims with the correct backspacing are about the same cost as Spidertrax spacers that are new.
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up