If you like your shoes flexible, low to the ground, with a soft underfoot feel and a Toe Box that gives your toes enough room to play the piano, then this is it! Add to that an outsole pattern that's got more traction than a tractor and you have a trail winning ticket!
This shoe is designed to be a fast trail shoe, ideally suited for the shorter distances. But if you're legs are used to a low to the ground, proprioceptive shoe, there is no reason you can't run longer.
Savage testers have used this shoe either as a training shoe, or in conjunction with more cushioned shoes on 100 milers. Consider starting your next Ultra Trail in this shoe, and then at your bag drop around the 50 mile mark, you can switch over to something to carry you home when the legs get tired (Think OLYMPUS).