Nice find indeed!
Since the Sysinternals apps are covered by http://www.filehippo.com/updatechecker/
I've so far just clicked the download link for any Sysinternal update, then select "open" (not save), wait for winrar, 7-zip etc to open and then extract all files to the relevant program folder. It all takes less than 20 seconds. But I'll give this auto-updater a go.
Hey I just got a related idea: maybe someone should make a "helper script" for the filehippo update checker. The script would monitor a specific folder (c:\uc for example) for updates and silently installs them when found. So users just save all updates (.exe, .zip ...) through update checker to that folder and the script does the rest. The script would need some (regularly updated) list of command line switches for the installer files.