FYI...The F-40 has a dovetail neck joint. The CV's are an F-40 shape with the graphite block system.
The idea here with the graphite is that it is such a good sound conductor, that it dumps energy from the neck back into the top of the guitar. It's been my experience with the contemporary series, so far, that they project extremely well with minimal effort. Also, bolt on necks make for cleaner and easier neck resets down the road.