I have a GroundHog Max and it works great!  I saw some post on several forums that said it was too small but I did my research and found that the videos about the GH Max were right on.  This disc is made extremely well and will plow more ground faster than a 4 ft pull behind with alot more down pressure for busting up the new ground.  I also like the ability of a one man operation and getting to the remote locations that a tractor or a pull behind disc can't get to.  I use it on a polaris 500 4x4, I think they recommend at least a 400 cc.  For $350 shipping included I thought it was the best buy for my money and have not been disappointed at all.  Hope this helps.