Ah, the uninformed Arctic Penguin.
You have no idea what you're talking about. How long have you owned your segway?
I've had mine for months now, and the shutdown mode works very well, if you follow the instructions written in the safety manual.
In VERY VERY isolated circumstances (that I've not hit in thousands of miles of travel), a glitch showed up in the software that miscalculated the amount of power available to the system. If you disregarded the safety manual, you'd fall on your butt.
Here's the glitch:
If a rider was on the Segway while it was slowing to a stop and warning the rider to get off because of depleted batteries,(controlled-shut-down mode) in some circumstances if the rider tried to agressively accelerate instead of getting off the beeping warning blinking segway, the Segway wouldn't have enough power to keep the rider upright.
So they are upgrading the software so the asshats won't hurt themselves. It's a 10 minute software upgrade.