Aside from the price and lack of a real problem it solves, which have been mentioned, the segway also occupies an in-between space where you can't safely ride i

Aside from the price and lack of a real problem it solves, which have been mentioned, the segway also occupies an in-between space where you can't safely ride it on a road, but you're in everyone's way and annoying pedestrians if you use it on a sidewalk (plus, American cities are often pretty terrible about even having sidewalks in places where you might conceivably want to use something like this). I remember we featured this as one of the futuristic new tech pieces at Disneyland's Innoventions, which I used to work at from 2000 to 2002. Virtually nothing we featured there ever really took off. Aside from the segway, we had Sony's AIBO the robotic dog, which was cute and fun to work with, but real dogs are too awesome for any meaningful portion of the market to want to replace them with a robot. We had an Internet-connected toaster that printed a weather report on your toast. Someone clearly had the sense that paper news was on its way out but people largely don't want to be chained to their desk while eating breakfast, but did not anticipate that general-purpose computing devices would become so small and mobile as quickly as they did, and something as niche as only serving the weather would never have a place. We had very early flat-screen TVs back when plasma was the only option and they cost around ten grand for an entry model. Those sort of eventually caught on when they were replaced with better and cheaper technologies that consumers could actually afford. I remember reps coming out and training us to use this for our showcases. It was novel and all, and the basic tech in terms of using weight-shift detection and gyroscopes seems like it should have good uses elsewhere, but I couldn't help but get the sense that, like the current top comment says, my body can already do this, and doesn't require extra storage space, charging, a place to dock, doesn't take up the space in a crowd of a 900 pounder. It's great technology, but the application makes no sense.