Well, it's the start of the 2012 season; and I just bought a new 2011 leftover Grandstand. I really wanted to test it, and practice with it before I took it to a customers yard. I tested it on a slope that ranges from 18 to 23 degrees. Used an analog slope indicator gauge that attached with a magnet to the frame of the Grandstand. All I can say is, this thing is a Goat. I will handle 20 degrees any any direction without issue. It turns on damp turn at that angle and don't tear up the turf. I'm very happy with this mower, should make a lot of money in the years to come. I'll try to post some pics. In the photo where the front wheel is off the ground...that's at 23 degrees; I put up the platform and used the walkbehind feature. Worked Great.