Treadmill transportation: The Rollator

I'm pretty open minded and love to try new things, but I just can't wrap my head around this gadget: The Rollator. It's a treadmill that moves, like a bike or a scooter or what have you, as you exercise. I understand that a moving treadmill would be more interesting than a stationary one in terms of scenery, but if you're going to walk on it while rolling down the street why not just walk down the street? You'll get the same workout minus the laughing and pointing of onlookers.

The only thing I can see that might be an argument in favor of the Rollator (and I'm really stretching here) is that you could get an uphill 'incline' workout even if technically you were traveling on a flat or downhill surface. Oh, and you could use it as simply a means of transportation (at your own social risk).

Interested? Or maybe just need a good laugh? Check out this video of The Rollator in action.