Rockman,
I have one. It is the larger model, 16" capacity. I bought it about 2 or so months ago. It works well for what it is intended to do. My reason for buying it was the fact that the saw teeth at the back along the moldboard hold you to the tree when you are cutting. If memory serves, I paid just under 14K for it, freight included. Downside is it weighs 2200 lbs. and makes the machine a bit tipsy if you are headed down hill. I have it hooked to a Cat 289C. I have not used it as much as intended yet as about the time I got it I had another project come up that has been all consuming with my time. I spent 2 days working it pretty steady , so that is as much time as I have on it so far. I cut quite a few small trees, in the 12" and down dia size, and maybe a dozen or so that were 24" and bigger. The largest was a Hickory in the 30" range. Let me know if you have other questions. I'll try to answer them as best i can.