I purchased the newly designed Exmark 21in mower and have had nothing but problems. The first hour of using the mower, the self propelled belt fell off. After tightening, the belt slipped off again and was cut in half. While the self propelled was working, the mower would frequently surge forward and get stuck in high gear. One time I hit a wooden fence because it just took off. This was also one of the worst mulching mowers I've ever used. The deck would get clogged even with dry grass. The only way to use the mower without stopping to unclog the deck was to side discharge or to bag the lawn. This was my experience and I'm curious to find out if any one else is having any similar problems. If you are in the market for the newly designed Exmark, please demo it first.