I have one fairly good sized account that has a couple of steep hills. Not overly large. One will have to be mowed sideways and the other probably up and down. This hardly justifies a the price of a walk behind but a good self propelled may do the trick. The hills are just are more than would be safe with the ZTR. I'm guessing 30 degrees but more in some area's. Questions: 1. would a 21" self propelled do well up and across the slope? 2. never ran a walk behind, do they do well across slopes? 3. I could probably even just us a simple but easy to push stable push mower so any suggestions on a model? Toro, Honda, price? 4. In other words whats a good small mower for the occasional steep area that needs to be clean cut (not a trimmer)? 5. Advantages of a walk behind over self propelled or the other way around in steep area's. Thanks for all replies, I'm not well informed in this area at all so just bear with me. Probably mostly side discharge, some is in front of a church so the cut needs to be crisp. One of the steep banks has a fence at the top. No room to turn. Steeper in some area's.