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As I said, SM isn't as reliable but they do regulate better and are cheap to replace.

Actually a switch mode power supply is usually a lot better than the old transformer for voltage stability. It continuously adjusts output to compensate for load and input voltage so is very stable....

It would simply be useless. There is zero benefit to be had. Most of the plug packs nowadays are switch mode power supplies and happily run for below 90V to above 260V. Check the advert Cambo put up...

For something that is powered by a plug pack and internal electronic voltage regulation the line conditioner will do nothing. Typically the plug pack puts out 1.5x to 2x the voltage the device needs....