Really nice engineering and machining, but that open bar tip is only a few inches away from his floppy sweatshirt and glove in the operator position. A hand-stop guard and operator station shield would make it much safer. Or, set it up to operate from the motor side where the chain would never be exposed to the operator. (flop the motor over to be out of the way)

 

At 3450 rpm the motor is far too slow to be useful so a lot of work for little gain. An electric chainsaw, preferably cordless, would be far more useful.

 

? The video appears to be live-speed, and the machine appears to cut the logs he has pretty fast. Sure, if it had a gas engine going full speed, he might shave the time from about 3 seconds on the biggest logs to maybe half that, but then he also isn't listening to the motor screaming at full speed all the time, or have to stop and fill it up regularly.