I put them on my new Mtn skis, and man do they tear up the concrete. they bite so hard you can't harly run the sled across the shop floor, track just spins. They are very light too. Maxdlx
I have them on my viper with c@a skis and love them. They have over 2K miles on them. I put a set of ski savers from berstom on between the bar and the keel and it really saves the ski.
the only bad thing i heard was when they wear a little, the outside edge of the bar touches instead of the carbide making cornering a little uneasy. if its in the budget i would get a set of triple point bergstroms. all i run is bergstroms now. they last a LOT longer!