The System Center Advisor team (formally Project Atlanta) now lists some pre-release documentation on exactly what information they collect and how you can view it before it gets uploaded. So if you are wondering what they collect you can have a look at the downloadable spreadsheet and see for yourself. Obviously this may change as it is pre-release stage and I expect more items to be collected as time goes on but this is a great start. Have a look
http://onlinehelp.microsoft.com/en-us/advisor/gg608184.aspx
Andy