Not really a fan either for the same reasons as have been mentioned already. I allow it to update my lappy which only has the base program installed so that I can refer to it when I need to while I'm doing www stuff anyway, but for my main DAW pc I just transfer the files I need from the lappy via USB stick.
I've always thought that CW's assertion that CCC gives them useful data re what percentage of people are using what OS is flawed as the PC that is doing the CC downloads is not necessarily the one that is actually being used to run sonar, so there are probably still way more W7 users out there than they think there are.