I am a die hard Vitesse user, I’m in the Vitesse II’s now. I recently picked up a few different Inov-8 models, including the Terroc, which is Inov-8’s closest competitor to the Vitesse.
The big difference between the two shoes is that Inov-8 core design principle is on flexibility of the shoe (longitudinal, fore to aft, of the sole). You can literally roll the toes of these shoes back up to the ankle. It’s akin to a “slipper”.
Thus, unless you have extremely well conditioned feet, you may have lack-of-support issues that could cause excessive working of the logitudinal musculature in your foot if you go try to bang out a high mileage day off the bat. Think of it this way: a slightly stiffer shoe like the Vitesse is a little more forgiving for those of us that are not regular trail distance athletes. Now, once your feet get in shape, the flexibility is a very nice feature and promotes natural stride better than a stiffer shoe.
The other caveat is that you really “feel” the track with the Inov-8’s. Hell cushioning is very good, but forefoot cushioning and a midsole is minimal. These are “slippers”!
The Mudroc 270’s are a really neat, and light trail shoe, but these effects (flexibility and midsole protection) are further exaggerated.
Add the weight of a backpack and the flexibility and midsole protection are even more important.
So, consider these aspects of the shoes, and recognize that your ability to use something like an Inov-8 will depend a lot on your foot conditioning for longer mileages, because the risk of overuse injuries with a less protective shoe will increase.
Good things about the Inov-8 Terroc’s relative to the Vitesse:
– lighter
– more breathable
– dry faster
– better tread for trails
The Vitesse gets the edge in:
– better off trail tread, especially for climbing
– more lateral stability with that huge side lug
– more longitudinal support, which is nice for backpacking with some weight on your back, not so hot for trail racing
From a fit standpoint, both of these shoes have nice roomy toeboxes and exceptional heel cups. This means that I (and I do mean “I” this may not work for you depending on where your metatarsal break is) can size up a full size over my normal size, my foot won’t slip around in the shoe, and I’ve got massive amounts of toebox room. That’s why I went with the Vitesse, and the Inov-8’s are the only other shoe I can do this with.
Will I backpack in Inov-8’s this year? Maybe. The jury’s out until I give them a whirl with 15 pounds on my back and a 30 mile day, I suppose.