not long ago i bought 50 rotary blades, no name, from a dealer named j.nockles on ebay. they were $3.00 each for 45's and i love them. yes, it was a big commitment, but i expect to be quilting for a long time. they are generic and fit all my brand name handles. i corresponded with him and i wish he had other sizes. i think they hold up as well as brand names. how long they last also has to do with thread count and weight of fabric and how heavy a hand you have. always bear down as little as you can to cut what you need.