Been looked at one of these (the 11 HP) to clear the small trailing blackberries, scotch broom and tall grass on my property - can anybody tell me if they are worth it? I have 4.5 acres. Been tackling it with a push mower but need help!!! Even putting in a perimeter fence for goats is a challenge until I get the brush down! Would like to putting walking paths through the woods also - just to enjoy it a bit! Are they fairly easy to control? ( I have used rear tine tillers and can control them just fine). I imaging the Briggs and Straton engine is a good one... Any advice would be great. Thanks!