It is astonishing how manufacturers can make mowers that provide an excellent cut at 10,12 and even 16mph. In considering one of these new Husqvarna models I am torn between the G730 and the K66. I like the idea of having a locking differential for the day when I choose to haul stuff or maybe push snow with it, but I like the fact that the G730 has a filter for easy maintenance and Hydro-Gear provides excellent documentation for servicing their transaxles. My yard is relatively flat and I never need to cut when the grass is wet, so the locking diff would only be for if I get the dozer blade and a massive lawn roller!