The big difference between commercial mowers and consumer mowers is the blade speed. The CPSC has regulated homeowner mowers to a certain feet per second. I forget what it is off hand. Commercial mowers don't have that problem so they run the blade at higher speeds resulting in a better cut and better ground speed.
So yeah increasing the blade speed is a good thing however most consumer mower decks are not built that well and the blades need to be balanced much better due to the higher speeds.
Anyone remember the old lawn boy mowers? They were two stroke, light weight high blade speed and a great push mower though odd wheel arrangement on it.
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