I have gone through 7 different brands of ZTR's over the last 10 years. Grasshopper is the best ZTR I have owned. I have had four total, and currently own 3 Grashopper midmount ZTR's. I had a 721D with over 3000hrs on it. Currently I have a 321D/61", 225/61", and a 428D/72". I mow some really tough, challenging properties with these mowers, and they perform great with no problems. I have been to the factory, and the quality control there is top notch.They have computers and robotics all over the plant. Can someone get a bad one? Sure, every manufacturer has a problem now and then. That is when your dealer should come to the rescue and get with the factory for warranty issues.
I highly recommend the Grasshoppers. I may get one of their new flip-up deck, front mounts. They take up no more room on the trailer than a midmount, and the flip-up deck really makes blade changes easy.
