I bought a set, since they seemed to get rave reviews here. Had to have two immediately replaced due to high road force values--but that was no big deal. [The tire shop saying it could have been from alignment, that was.] 3 years, 42,827 miles and they cracked. Bought for $978 and got a return of $176.24 as they had 5/32's left.
Maybe they would have gone to 70k but I have my doubts. I no longer drive to 2/32's and so I don't buy on warranty anymore. Plus I was not impressed with them in snow--for all their rave reviews they seemed just, well, normal (and utterly insufficient on my truck in snow). I only put about 5k/year on the truck now (on all seasons) so they are totally not worth it to me. IMO I'd have to do 30k/year for them to be worth trying again.
I did recently run my Hancook Dynaopro ATM's on a bit of ice, and it's possible that the LTX's would have done better--it's been three years since I last drove on them--but it's possible that the LTX's were better on hard packed snow / ice than these ATM's.