Well - I just saw the "world changing" part a few weeks ago at Disney World. It's not on the market yet, but just received FDA approval a few months ago.
There's a 4 wheel version of the segway (called the
iBOT ), which is equipped with a seat. It's for handicapped people. The 4 wheel base can rotate around so it's standing up on 2 wheels. The base can continue to rotate and it can climb stairs. So it's a handicapped device, which can go up and down curbs, stairs and turn on a dime. When elevated up so it's only standing on the two wheels the rider is eye level with people who are standing and/or can reach items in kitchen cabinets etc....
In the demo I saw, she wasn't able to push it over, so it's that strong. If it's up in the two wheel mode and you push it really hard, it'll "panic" and revert back to the 4 wheel mode. So it can't be tipped over.
This is the part of the Segway technology which will be world changing for those who cannot walk.
