They worked well, but I did get in some real sugary snow once and slipped the belt, at the time I didn't have any screen in them, just straight open. At times they can get snow packed. I did another set on a 10 m8 LE and it turned out twice as good, then put in metal screen and they work sweet. But it was very time consuming, and on mine I heated the plastic to quick and it caused discoloration, on the m8 they look perfect. Also on mine I tried to leave some of the stiffening structure on the back and on the m8 we cut it all off so the back side was smooth to start with. The very back vent likes to try and return to shape and needs either 2 small vents (one on top the other) or a spacer of some sort, the metal screen helps hold them in place also. Only worth it if you have patients and free time.