I have a site that doesn't need https throughout but I wanted it for admin logins and I have a private WP Page that is password protected that I notice is stored in the database as plaint text.
I could have acitvated http to https using my web server but that would apply to every page and given I have my own self-signed SSL certifcate just for this private area, that was overkill.
This plugin has allowed me to easily force SSL for admin and apply SSL to the single page I wanted to run over https. Fantastic. Great work.