Delaneymorgan, the Henry Micro is the same as a regular Henry except it has upgraded filters.
The Autosave is no longer in production. Numatic have gone back to twin speed motors with a normal rocker switch. AutoSave was similar but had a spring loaded switch to put the cleaner into high power so it defaulted to low power when you turned the cleaner on, hence the term "AutoSave".
I'm sorry, I'm not sure what you mean by "built in accessory plug"?
