Our brush hog has been doing just as good a job on my son-in-law's grass as his Craftsman 50" cut garden tractor with a so-called finish mower. It's "country" grass, mostly bahia, 2-1/2 acres of it. He now prefers to use my tractor and the brush hog because there isn't much difference in the cut, and it's a lot faster.
Couple of key things - yes, the brush hog leaves windrows of cut grass rather than dispersing it, as mentioned above. And, since it's fairly new and hasn't been used to mow rocks (there aren't any rocks in our part of Florida), it's still pretty sharp. If he as really concerned about the windrows of grass, he could use the landscape rake on the back of the tractor to clean it up, but they disappear after a day or so through wind and sometimes rain. The brush hog is a 4' Rhino SE4 (light duty), and I've been reading some good things about the Rhino in the last couple of weeks. We have it adjusted pretty close to the ground; probably 2-3", and cut every week.
Not only does it do a fairly decent job, but the end result looks better and better when factored against the brush hog costing less than 25% of what a finish mower would cost...
Attached is a shot of his "lawn" near the back fence. It's never going to be on the cover of the Scott's catalog, but it doesn't look any worse than the neighbor's grass on the other side of the fence, which is primarily maintained by goats... /forums/images/graemlins/grin.gif