I'd give them 6 stars except that the part that wear out is the wheel and if I could just buy the wheels that would be perfect!  They work great in a one person shop.  great for cutting plywood or other large items that really want a couple of hands.  I don't use them all the time, but when you want a really nice cut on something, and NOT telegraph the times you re-position your hands while pushing the work thru, these do help out.