FWIW, I've run Tom Woods 1310 double cardans on my '09 JKUR for ten years. Other than some brinelling on the rear u-joint of the rear shaft I've had great luck with them, no breakage. I suspect the brinelling is due to the milling of the off shore mfd'd yoke, which I'll replace with a Spicer soon.
'09 JKRU. 4" Teraflex long arm, Teraflex R44 housing, Teraflex / Fox Resis, Poly Performance skids, Nemesis Billy Rockers, Nemesis flares, 37" ATZ P3s on 17" 5x5.5" Trailready HDs, Spyntec hubs, Teraflex BBK, Mopar BBK master/booster, Superior front & Alloy USA rear axle shafts, CTMs, Reids, Synergy drag link & tie rod, WTOR hydro-boosted steering, 5.38s, TF Dual Rate front bar, TF bumpers, Warn Powerplant, Tom Woods shafts, AA xfer case cable, Kilby canister relo, RH4x4 cage.