I bought mine from Ziegler back in 2014 when Lifetime was an option and WOW, have I got money's worth. Transmission (blew twice but once would have been covered by the factory warranty), exhaust manifold bolts, thermostat, 8.4 Uconnect system and I just got my truck back after getting an entirely new engine!
Granted, my number of problems is outside of normal but if not for the warranty I'd have dropped this truck by now. The trick making it pay is you must keep the truck for a long time and don't do a bunch of mods that give them an avenue to get out of coverage. Also, having all the service done at the dealer helps so all the records are there. My truck has literally not been touched by anyone other than the dealer. Also, be sure to really read the manual and to all the recommended service and maintenance. Honestly, there's really not much but you have to do it. For example I paid the dealer $800 to swap my plugs at 100K miles and if not for that I'm sure they would have tried to deny my recent engine replacement.