I haven't got one but I've seen the advert - its not a robot mower, its got large wheels so it moves around easily and you have to push it yourself. Differences between it and other mowers is its rechargeable electric, so no cord, has an easy lever on top to change the height of cut, and an extra large grass collection box. Not cheap though...

Seen the advert, but I need one which I just follow around. My petrol one drags me along quite nicely.
I know it is not a robot, self propelled means that the motor drives the wheels round as well as the cutting blade.

Oh I see, that never occurred to me - looks like its being guided along by the person running it, but hard to be sure. Even so, surely, if its powered, it would actually run away on its own unless its got a handle you have to keep depressed to keep it running...

I quite fancy the Gtech powered bicycle... but no good for cutting grass!