They work great.. Last year I had a problem with the wiper arm stripping out the grooves and was left with freightliner not being able to replace arm with the exact one. In order to replace arm I had to buy another style arm and remove the keyway. Not say these slush buster caused this but I have no other reason to believe it didn't either.. I religiously and manually move the wipers when frozen in place as muchbas possible.. Wish I had enough faith in them to use them again but with no replacement parts from freightliner..I am gunshy. They do work good.