Ok. I bought the Makita chain mortiser.I is pretty much what I expected. After playing with it and setting up a system for cutting a 2 x 8 mortise, I decided to buy the 21mm chain. ($400 later) to reduce the side steps from 4 to 3 cuts. Now after 12 plunges down i have an accurate 2 x 8 mortise with nasty points on the bottom. I think if I got a pair of ferring clippers, I could nip them off nicely.