There is a toggle on the demo page that flips to vector. I also found that if I hold ctrl I can rotate at random and even go "3d" and see some of the building'

There is a toggle on the demo page that flips to vector. I also found that if I hold ctrl I can rotate at random and even go "3d" and see some of the building's heights (in London anyway). I've got no interest or relation in this (apart from being a OSM contributor years ago), but this is one of the most convincing alternatives to google maps I've seen. The free-rotate on the vector tiles really makes a difference.