Just purchased this unit on 8/27/2018. Currently only have 3 hrs on it. I did demo a ZT HD-52 prior to buying. I purchased the ZT HD-60. The demo model did not have the $150 seat-isolation kit. That kit is well worth it. It does smooth the ride out substantially. My yard is not smooth. I mow my yard(4.5) acres and have a few residential yards I mow weekly(.35 acres each x4). I can mow my 4.5 acres in about 2 hrs. It mows very nicely and the cut is much better than my 54" HC John Deere deck. I also did demo a John Deere residential Z-trak prior to buying Gravely. Didn't look at any other brands as I wanted to stick with my current dealer that I have been very happy with.