have an arrma granite 4x4 mega, very durable, so far the only thing that broke it was a full speed run into a steel pole. broke the rear A-arm.
for some reason when we got it the esc was acting up, LHS got ahold of Horizon and swapped it via warranty on the spot.
(i dont think it was common for the esc failure as LHS guy was about as confused as we are for what it was doing, and he sells these primarily.)
parts are cheap, and for me are available, (traxxas cut off parts supply to my LHS) it is pretty fast, tires get really good grip, very easy to work on, typically cheaper.
had about 20 packs in but now it was swapped to a hobbywing BL, so far we swapped out the HD input shaft and that's it since the upgrade.