A few observations:
Cars have now started to stay out of the blue in some places. Not at junctions, of course. But Upper Tooting Street up to Bec has a nice wideish strip of blue to ride up the left of the traffic. Not such a success, really as the motorists have tended to hang right there, and it's usually been possible to ride up the left.
Some cars & vans are using the blue paint as a sort of ASL so they can creep further onto the road before having to give way to the 'real' traffic. This gets on my wick.
There's a lot of parking in the blue lanes.
The lanes don't do anything useful round any of the many dangerous & badly designed junctions on the A3.
There are a number of pieces of roadworks labelled as CS7 which don't seem to have much to do with cycle highways. A couple have deep trenches for gas or water main. Several are about putting block paving in the mouth of side roads, which will, of course, make it more dangerous to turn off the main road. I think some of the funding has been syphoned off to things which don't contribute, but TfL wanted to do neat the route.