I don't know which one your looking at, but here's my 2 cents worth. The hydro walk behinds are great when their new but after a season or two all of the control linkages (which are nothing more than steel rods with holes drilled in them to connect to the other control links)wear out to the point that you can not adjust them to track or maintain equal wheel movement. Some of the older (pre-1998) walk behinds don't have any grease fittings on the spindles either.<br>The riders such as the Twister are a nice mower however they suffer from DIFFICULT TO MAINTAIN engineering. The spindles do have grease fittings, but the fittings are mounted so close to the spindle flange that you can't get a grease gun head on them unless you loosen up the grease fittings. The rest of the greasable points of the Twister are very difficult to access and usualy won't accept grease due to the poor engineering of the parts. I'd like to boot the guys that engineered these mowers. However, maintenance issues aside, they are comfortable to use and provide a nice cut.<br>I could go on and on about mower design and engineering, but that's for another topic.<br>Hope this helped.<p>ps. Looking at the new line of Bunton "TEXTRON" mowers, they finaly have addressed SOME of these issues.<br>