I use PSI 2.0, not the newer PSI 3.0 version.
I prefer the older 2.0, as I have more control than 3.0.
I don't do any updates via PSI, I just run the scan and manually download and install anything that needs updating.
I also use FileHippo Update Checker.
FileHippo Update Checker checks for program updates.
Secunia PSI checks for missing security patches and end of life programs.