Chazbikes (off Blackriars road) gave me a C1 when they ran out of time fixing my VFR.
It was awful, really hard to activate the stand, slow, you can't filter very easily, everyone laughs at you, feels like you're going to fall over on corners etc etc.
On the plus side, nice and warm and dry, windscreen wiper, leather seat and some even have radios!
I can see how they appeal to some. I'd rather have been riding one last week through the monsoon conditions and the cold mornings.