I have been using Landesk for Over 5 Years and have been using both WSUS and Landesk Patch Manager. We currently Patch our environment with WSUS and are very aggressive. Since WSUS has a direct connect with AD objects you can update all machines that may have not have Landesk Agents. I would like to see a direct sync with AD that can import all objects and be more reliable. After our first pass with WSUS we autofix all of the patches in Landesk Patch Manager.