Honda has four different mower series: HRC - Commercial grade, fully rated for daily commercial use. Twin blades. Thick steel decks. Composite NeXite wheels, handlebar supports, 2-stage air cleaner, etc. Available in a shaft-drive self-propel and push models, both with commercial grade engines. HRX - Premium Residential, GCV residential engines, hydrostatic drive, SmartDrive, electric start, NeXite composite decks, Clip Director. Variable mulch/discharge/bag. Twin blades. HRR - Steel deck residential mowers. SmartDrive, electric start. Rear discharge, mulch or bag. Twin blades. HRS - Steel deck, side discharge or mulch. Flat deck, 160cc residential engine. Single-speed self-propel or push. Full Line-up Here: Honda Lawn Mowers -Robert@Honda Caveat: I work for Honda, but the preceding is my opinion alone.