I have several questions in regards to walk behind mowers for my lawn. I have a half and acre which is mostly flat except for a portion of my back yard. That area is fairly steep. It averages 20 degrees and is approximately 125' left to right and 40' in length. I currently use a 2 year old Arien's WAW-34. I mow the hill straight up and then turn around and go right back down. I have to put the mower in reverse on the way down so that it does not take off on me. I think this has been hurting my mower. I have noticed lately that my mower sometimes will not go into reverse or forward after mowing my hill. I'm assuming walking straight down the hill in reverse is damaging my mower. So I am looking into getting a new mower that is more appropriate for my lawn and will save me time. I know a half acre is not much compared to most of you on here but I am leaning towards a commercial mower for speed and durability. I have been reading about Hydro Mowers with Sulky's (stand on and ride attachment). I would be nice to zip through the level portions of my yard and then walk behind on the hill. My main and serious question is do Hydro mowers have breaks or simply take off down the hill like my WAW-34 does? Its kind of scary running down the hill with a large mower. What type of transmission should I look for? Any suggestions on Manufacturer and make? Thanks for reading.