To be fair, he has been seen on one a few times but the main problem at the moment is that there are not enough bikes for the demand at present. I was tempted to join as there is a docking station down the road from my work and I normally walk 20min to Charing Cross but in the morning the Charing Cross docking station is usally empty and in the evening the rack near my work is empty too (too many people having the same idea!) hopefully they will add some more bike docking stations soon.