OK, wow, what a nice machine! I traded my Z121S in on it.. What a difference going from a residential to a commercial. I now have a 54" cut, 11.5gal fuel tank, a MUCH larger foot area (I'm very tall (6'6"), and it fits me very well, hard to find!), fuel gauge, and wow, that seat is AWESOME! I'm impressed with the difference in tires. The 121S had the low profile tires, which didn't soak up any bumps... probably why they put the suspension seat on it ... the Z724X's tires absorb bumps nicely. It's very sturdy looking as well.. pricey, but it should last a LONG time!