ProGrip 3400 is not bad, but for enduro if you are sweating allot than are no good, the lens begins fogging in slow sections in the upper corners and doesn’t go away if is allot even after you are picking up speed. That was one reason i changed and the other the lens is scratching relatively easy, easier than Scott. The lens does really change the color allot, in winter with snow and sun it turn from light brown till dark purple, very interesting. Other dislike is that is ticker than Scott and are restricting the vision field, pretty much when you are controlling your back, also the elastic band comes easy off the helmet from branches, more when wet.