Just like with anything, buying used is a gamble, but peeps from MPH seem to go through blowers like water. Usually there is a decent amount to choose from or you can try calling up there and they may have some on hand. Cams are a great choice for power adders, but IMO they don't hold a candle to what fun you can have with a blower. If you are semi-mechanically inclined, then the installation of the blower is not hard at all. For me, the hardest thing was putting on the belt, what a PITA!
