I don't know much about chippers, but last year I spent a few days using one that looks exactly like that one, a rental. The feed rate was rather slow, and with the short intake chute, you have to be careful, because it can grab a long branch and whip it to the side violently, and if your leg happens be near the chute opening, it can give you a hell of good clobber. If I fed it too fast, the innards would clog up bad, and the machine wouldn't run. Clearing it out took a good while, especially of it was clogged up bad, with poor access to get to where you need to clean it out, including the exit stack. Anything too large and the machine pulled it through in stages, I guess some kind of clutch regulates, and you end up standing there and waiting too often. For short small material, I guess under 2 inches in diameter or so, it worked OK.