Keith I see several guys around here running them. They don't seem to be having an HOC issues as their properties look pretty good.
I tested out an older model a guy by me had for sale a couple of years ago. I didn't mess with the cutting height too much, I just moved it up a notch then back down to see how difficult it would be. I cut the empty lot next to his house and it left a very good cut on weedy Bahia.