Submissions to Symantec

I'm considering whether to turn this on or off in our new environment.  I've read the info here:

http://www.symantec.com/connect/articles/submitting-information-about-detections-symantec-security-response

Can someone tell me a little more about how enabling these settings would benefit the security of our company?  Also, how much data would be uploaded through our network?  Does the data go from our client to the SEPM and then out to Symantec, or does it go directly from the client to Symantec?