I have a DR mower, 17 hp, chains, blade, chipper, 42" finish and 30" brush deck. I still use it a lot, even after buying a Kubota BX25 a year ago May.
The DR can do some amazing things, but it is a slower go at most jobs than the tractor. It will 'mow' over 1.5" trees and cut 6' tall grass and brush. It chips up to 4" branches.