I bought the Gravely XD21 model 911270 in March of 2012. Have had it 5 years used only for residential here in the midwest. That means I've used it, on a standard 1/4acre flat lot, about once a week, for maybe 9 months a year, for 5 years. Total of about 200 times. I do the regular maintenance on it, though I do need to have the blade sharpened. I hate this thing. Here's what I think about this supposedly "commercial", "made in America" product. Engine doesn't start like it should (FJ180V-AM18). The automatic choke doesn't set. I have to prime the hell out of it to get it to start. Once it does start, it runs well and the Kawasaki engine cuts through the thickest of grass. This one does not have the manual choke or brake stop. Also, the manual says there is a fuel cut-off switch, but it does not have one. Suppose to prime twice, and let her rip. Don't work. The chassis design is terrible. This thing will side discharge fantastic. It will bag and mulch the hot summer grass well, when the grass is thinner, dryer, lighter, but the spring grasses which are thicker, moister, heavier get stuck up under the deck and start dropping out on the yard in chunks. Ugly and disgusting. I don't mulch at all anymore. I mostly side discharge, and if I do bag, I empty the bag often. Also, it has a tendency to "mowhawk" the yard. The wheels are of poor quality. For only 200 times of use, the rubber on one of the rear gear driven wheels has separated into two parts. See pictures. A replacement wheel is about $70. The front ones are not gear driven yet they run over $60 too. Why are they so expensive? I'm trying to rig my mower up to use a single drive wheel and replaced the bad wheel with a cheap one from the box store along with some spacers to make it work. I'm wondering if this will ruin the belt driven differential . Also, the rims of the wheels are constantly getting dented out of shape. I have to use a hammer to pound them back in shape. So having spent $800+ dollars on this thing and expecting it to last 10+ years without major issues, I'm pretty disgusted with it. From now on I am only buying the cheap box-store products every few years. My old mower was bought from Montgomery Wards and lasted 15 years. Engine still ran on it, but the wheels were falling off the chasis. That's one reason I wanted this Gravely; it was suppose to have a durable deck and wheels with bearings. Guess I should've looked closer at the rubber on the wheels. Sheesh.