The problem with various update programs I have used has been that they either alarm for nothing, or leave crying "Wolf!" when it would be needed. Or, then you have to go deep water fishing for those updates... The updates aren't easily found, making one wonder "Why don't I go to the pages of manufacturers and makers myself?"
I was highly skeptic when I tried Secunia PSI, but it certainly surprised me, and did it in a good, good way.
1. No false alarms, really.
2. The interface is extremely clear, nothing unnecessary, nothing needed is left out - at least for a layman.
3. Updates were found immediately, and it even gave me Microsoft security updates in .NET Framework, ones MS never offered.
3. Whilst looking for updates, the program followed all the way and, like an Adobe update turned finally out to be unnecessary, it knew it before I did. It seemed to pick up the info from Adobe page faster than I could "Google Chrome will automatically update this..." So the urge disappeared from the list before I could say "Coffee".
If I ever recommended something, this may be the BINGO!
License: Free Details...