I've got my eyes on a nice, used 52" Exmark ZTR. I already have a couple walkbehinds. I'm looking at the ZTR because #1 they're faster, #2 I've run across a great deal..........but here is my concern: They're good for flat areas and decent slopes but a lot of lawns have drainage swales/ditches in the front yard that cannot be mowed with the ZTR. So, my guys would have to park the ZTR, get out the walkbehind, mow the ditch and load everything up. We're talking .3-.5 acre lots. Where's the benefit? Feedback? Thanks.