I had a 10-80 for a few years.
Bought it thinking it would be just the ticket for making deer plots in rocky, rooty soil.
I was very disapointed with it as it wouldn't cut very deep and didn't turn the furrows over worth a darn. I chained about 200 lbs of elevator weights to it and it did work better.
Also, here's a warning for you: Either shorten up your check chains or use a stabilizer bar with it. As per intructions you need to shorten up the top link to it's shortest position. What happened to me was because the plow is so close when I lifted it it swung over and mashed my left fender.
Between the poor plowing it did and the mashed fender I was rather discusted with the thing and went back to a moldboard plow.
It sat in the bushes for a couple of years and then I sold it.
Fender is still mashed and I cuss that darned plow 5 years later.