Essentially a tricycle, that you stand up on, it combines the functions of pedaling and braking with the upright steering position of a Segway.
There are as with most things, pluses and minuses. It's great for fitness, visability and excellent control on those short commuter trips.
To steer, simply lean in the direction you want to turn and go for it.
It's easy too, to take on public transport or to carry by hand. It's not so good for bringing home shopping from the supermarket.
There's more about it here and it's for sale here.
But no, not at half price...