I have or have had, Samsung, Visio, Sony and Insignia flat panel television sets in my rigs and never had a failure in the RV. I've experienced troubles with all those brands at home but never on the road. With my previous rig, 1990 Bounder, I bought only sets that used plug in switching power supplies so I could hook directly to the 12 vdc outlets. Even my BluRay players are hooked up directly to the house batteries.
The Adventurer has a 32" Sharp that is 20 vac only and a Sony BluRay that is also 120 volt only. The bedroom set and player are both Insignia and are 12 volts.
My only concern with the 12 volt sets is that they are always in standby when not in operation and are one of the biggest parasitic draws on the house batteries. I installed switches between the batteries and the 12 volt sockets in the Bounder but I'm still working on that for the Adventurer.
So I guess you can consider me in favor of LED sets with 12 volt capabilities.