Absn - I'm sure SDC is a good and safe product to use. I don't use it because I'm anal retentive about what I put on my hard drive. It's not important to me to have the most up-to-the-minute build of anything. I upgrade only when there's a change in the version number.
SDC installs extra files related to the various forums, the webpages it links to, and a handful of other unnecssary file/information. I own three SD products - WB, DesktopX and Skinstudio. There's not a lot of update maintenance to worry about with those programs. All are excellent and stable. If I owned the entire Object Desktop Package, I might feel differently about SDC, but I don't, so as far as I'm concerned SDC is simply an unnecessary middle man for doing what the program installers should be doing. Not an indictment, just my preference.
Hope that answers your question.