i turned it on a few weeks back to try it out.
I have had not 1 sale using C&C but my sales overall are about the same

I do send all mine by large letters so that could be why its not being used, but occasionally i get instructions from buyers asking to leave at front door as it wont fit in their letterbox

for me im happy for it to be an option whether i get anyone using it or not im not fussed but its important to note that its not hurting my sales at all