Full details here
They don't stick out as far into the road as I'd feared when parked, but I did notice that there doesn't seem to be a reflector on the bit that sticks out furthest, which might be a problem if someone drives past at night. It's possible that I've missed something, of course, and it's possible that the paint itself is reflective, I couldn't tell.
The bikes seem solidly constructed, looking at the Guardian report it all seems reasonably positive.
Overall I wish the scheme well - I could just wish that they hadn't destroyed the motorbike bay nearest to work as part of it, but that's me being selfish. I'll have to drive by and see if they're replacing it or something.