Yea I ran it Sunday and Monday, wasn't as impressed as I thought I was going to be. First off when my salesman dropped it off Sunday an I hooked it up and kicked it on I noticed it had a bad bad vibration, got out we checked for missing teeth and for broke teeth but everything seemed fine. I'll get back to the vibration later, the cut: i had to see what it would do so i cut threw a 18 inch popcorn tree no problem then mulched it up with the teeth on the bottom of the disc this took about the same amount of time that my fae would have taken, smaller trees and underbrush works good in just need to go slow and keep the disc speed up because once it's stalls out it takes a good 20 seconds or more to be back at full speed. I was impressed with cutting and sucking in and completely mulching up 6 in pines in the blink of a eye. I wouldn't recommend running any oak threw it much bigger than 4 to 5 inches even at full speed some times it would cut an suck it threw and mulch them up an some times jam, some times I was able to put the disc out the edge of a stump an turn the entire machine to try to dislodge the jam but other times it took a chain and one time I broke the chain 3 times before I got the jam out. Oaks that size or bigger need to be cut down then, grind with the teeth on the bottom in my opinion, but some times that hard when u cut it then it sucks it right in,but more seat time running it u would probably get better. Now back to the vibration I called a guy that's got one already to ask if his vibrates bad. He said its not supposed to vibrate that much but, said not too long after he got his he was trying to mulch a rotten pine tree when the disc found the heart of the tree a suck it in and jammed after the jam was free it got a real bad vibration. Come to find out he had bent his shaft he said if he had to guess that's probably what was wrong with the one that I demoed, I didn't get to talk to him till after I demoed mine so I couldn't check to see if it was bent, so finding that out I think I'm going to wait until there's more heads running and just to see how the last.