Rottman, I have a navigator with about 300 hrs. on it and it is a great machine. I have found out if I run over the leaves first with my z or walkbehind which both have mulch kits it makes going farther before having to empty hopper. The only thing that has gone bad on the unit is the alarm that sounds when the hopper is full. They use the same one that is in the walker and are changing it. The local dealer replaced at no charge. Its a great machine.