I have put about 10 hours on it and there is a learning curve. On my machine(19gpm) it will handle the small stuff really good. Once you start getting up too 10 inch trees it slows down. Of course I have no idea on what to compare it's performance too. Here is a video of me doing a Cedar tree. It was about 10 inch size at the bottom. Torrent said the mulcher should handle 6 inch and smaller well on my size machine.
VID_20130615_165134_086.mp4 - YouTube
I still have not perfected the feed rate. I did not purchase it thinking I could do really big stuff it was more for underbrush and small trees.
I was playing around with large tree on the ground.
VID_20130615_164849_499.mp4 - YouTube