Pros: I was impressed with the neat box the knives came in. They cut very fast! Much better than the router bits I've used, especially for holes larger than 1/2 inch. I wish I had cutters that drill deeper holes. Bad: One of the cutting knives broke on the first day of use, only on the 7th. I drilled the hole. These are pretty expensive bits, that's why they break so easily. Maybe it was a broken bit? I haven't abused it.