I install one on my QL 1650 this year, the first time I try it one side of the drive shaft disconnect, I fixe it and 5 minutes later the other side disconnect, I fix it again, then the belt start to slip, I store the tractor and use my trusty Arien walk behind snow blower.
I manage to fix the belt problem the next day, and give a try again yesterday (9 dec 2013), this time the rotor chain broke and I can find a part number to replace it, now I wonder if this POS worth anything since it's throwing the snow only 10 feet's from the tractor. I even replace the OEM 4" pulley with a 3 1/2 " one to speed up the rotor a bit.
I will fix the chain problem and do the "rubber mod" to the rotor and we will see, for the moment I cross my fingers because finding a 190-364-100 2 stages snow blower for my machine it's rare like pope a$$ skin.
Update 12-12-2013: I just change the #40 single pitch master link on the chain instead of buying a new one, now I try to find good rubber for the rotor flaps mod...:-) Any good result on your side FlyingB?