I have some small stumps in my garden that I can't mow and then I have to go back and weed the grass because the mower can't reach it. I got them to grind them up so I can mow right over them. Worked like a charm, quickly crushed stumps. I have to admit that it was a bit intimidating to use at first, but after a few minutes it was easy. The discs are very sharp and will clog, so you will need a wire brush to remove the wood from them. They feel solid and you get 4 drives, so that's a huge plus. Haven't tried them with woodworking but I'm sure they will be fine as they went right through the stump. rzunimag.