First off, this is the first time I've ever posted to a forum. I'm usually "lurking in the shadows", but I felt the need to give my two cents worth. I run an ASV SR80 with a high flow Bradco Ground Shark. I also have the stump grinder teeth option. This is the only brush hog to own, In my opinion. The only attachment more productive on heavy wood would be a forestry head. Advantages of this beast: it can process 6" softwood all day, grind the stump down to grade, grind/ mulch brush piles, has oil pressure gauge standard, and the largest bearing assembly I have seen on any brush hog. Disadvantages: extremely heavy at 2008 pounds, a little pricey (I paid $10,000), blade and stump teeth are expensive to maintain/replace. The replacement knives (4) from any dealer cost $1200.00. Absolutely ridiculous, but with some serious searching I found a machine shop that sells them for $80.00 each. Same thing with the stump teeth (18), dealer wanted $400.00. I found teeth for $7.35 a piece. On two to three year growth, it leaves a lot of stems still standing, but then again this isn't made to cut grass. Please ask any other questions. There doesn't seem to be a great deal of information about this model out there to ask people about.