I've been using a Honda powered Troy Built 21 inch for my first year so far. It's from Lowes so it's not commercial. It was all I could afford at like $350. Been doing great so far but was wondering what the advantages are of using a commercial instead. Seeing as how they are about 3x as much, surely there is a long list of differences. The main questions I have are: 1. Is there considerably less vibrations ( my right hand is already aching from time to time )? 2. Will it cut at a greater speed to increase productivity? 3. How much longer will it last than a standard "home" mower? I was thinking of returning the $350 one I have and upgrading to the top of the line ( at lowes) which is a John Deer 8.75 hp for $500. Can anyone tell me what differences 8.75 hp will be vs my 6.5 hp?