I just put the Synergy ball joints in mine last week. I have a 2011 with 4500 miles on it, and the stock ball joints were already going bad. I go exploring in the back country every weekend, usually not super difficult trails, but half the miles on my Jeep are off road miles. The Synergy ball joints certainly look a lot more stout than the garbage stock ball joints did.
SOLD -- 2014 Wrangler Sport: Teraflex/Synergy 3" suspension lift, Fox 2.0 reservoir shocks, Tom Wood 1350 driveshafts, Dynatrac ProRock 60s w/ 4.56 gears and Eaton electric lockers, Warn front locking hubs, Currie Anti-rock front swaybar, Fox ATS, 37" Toyo MTs, Poison Spyder bumpers and rocker guards, Warn M8000s winch
2016 Ram 2500 Laramie Power Wagon