I looked at one a couple times not too long ago when I was researching ZTRs.
I found it to basicly be a zero turn tractor with a residential mower deck (read great manueverability, but slower blade tip speed so overall not that much faster than a good GT. Sort of like the smaller Deeres (z2xx's ?). If you're coming from a conventional lawn or garden tractor, it might make you happy.
The Enforcer series is a heavier built unit with faster ground speeds, and a semi-commercial weight, fabricated deck with higher blade tip speeds. But here too I found things I didn't like: No access to drive belts from under seat (has a solid plate bolted in there); and since the floor pan is not easily removable, you have to reach in from the side to get at the grease zerks. Again, probably more than adequate for the typical homeowner.
My problem was I was used to a full commercial unit (older 3 wheeler) and just felt any consumer and pro-sumer units fell short of my expectations. I ended up biting the bullet and stepped up to a DC Silver Eagle 2700-60D.
I have had the Z-Force 60 for 2 years now, 129 hours. I love the cut, and the ease of use. I have had zero problems and use it to mow 2 acres.
Previous mowers were a Simplicity 38", early 90's tractor, and a ProMow 7 gang reel mower. No comparison with the Z-Force, great unit. Many nicer ZTR's out there, but I did not want to run a heavy commercial unit over my lawn, and the price I paid was in my budget.