Why are lo pros good to ride round london?

Seeing those lo-pro, I'd think that the smaller front wheel would mean that they'll be slighty lower than usual and thus not as easy to see ahead in traffic, and of course your body is more hunch over, thus putting too much pressure on your hand.

why is it so comfortable? (not ridden one yet).

The best one I've seen so far are the matt-black Bob Jackson lo-pro I kept seeing around Clerkenwell ridden by a courier with longer than usual arms.

that's Arak; he's about 6'2" and his saddle is nearly at chest height on me and I'm 5' 10". He's the Flkwg of couriers.