Seems like that was one of the "benefits" to this kit for the "vertically challenged" (myself included) -- I'd heard 4-6" lower average seat height compared to TS?
That does sound interesting... I absolutely love my Mountain Horse, but in soft snow, getting back on the bike can be REALLY tough. My 74-year-old dad with two new knees is really intrigued by snowbikes and is thinking about making the jump from a sled, but the height issue might be too much to overcome. Sitting a few inches lower is a great idea.