My parents have a crappy little Craftsman one that they never use, and a DR one that works pretty good. You can feed a 3" log into it at a rate of probably 1ft every 10 seconds or less (much faster with wet poplar, a little slower with dry hard oak). Makes nice chips. Only down is the inlet chute is at about a 50-60 degree angle so you have hoist everything up to put it in. Also the chute has a pretty small opening, maybe 8-10" square, so you have to pre-cut branches that really spread out. It's been a good working, reliable machine for probably 10 years, but because of the chute size and angle, you gotta be willing to work too.
