The first time I saw one of those in operation, I had to stop and watch. 10 - 12 foot cedar trees went WHOOSH - just gone in a cloud of dust and chips. That is a very impressive machine.
I want my own landclearing business, and the wife just gave me permission to go for it this past weekend. I don't know if I have the balls to give up a good steady job right yet though.
My dad agreed that there probably isn't a business I could own that better suited me.