I've only used the largest bit but I've used it a bit on every drawer and door finish in my last project. I've used it on finished plywood and the bit hasn't ripped the ends or surfaces into pieces, which is easy to do. I estimate I ran about 50-60 feet of board against the bit. It started with the same quality it ended with, the plywood glue left some dirt on the edge but it wore off. I think they're decent little pieces.
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