In short, it was a loser, never met expectations, got bought by a Chinese company, and they stopped making them.
However, here's an important footnote in the company's troubled history...
Segway was sold to British millionaire Jimi Heselden, chairman of Hesco Bastion in December 2009. Ten months after buying the company, Heselden died after he accidentally drove a Segway off a cliff.
Thanks for the info. Almost sounds like a Monty Python skit.