The CS Series is a new design altogether. The capsule was redesigned by Brent Casey changing the trim rings to smooth out the response. While this model is more expensive, it also incorporates the new HALO Shock mount...This new mount is very flexible and allows other mounts, Tbars and attachments to stack onto the HALO for some very cool mic arrays.
I believe the new CS Series will be a mic that will become a favorite to a lot of people. We have just started shipping these so it will take some time, but Mandy Moore just did her new album with the the CS5 at the Village in LA and was blown away, so the reports from those who have it have been very favorable...
Having the 4 pads is very useful and really does not add too much to the cost. The cost is mostly in the capsule and all new electronic circuit.