Rated 4 out of 5 stars

Very nice! Would be even nicer if I had the option to configure

-Send tomorrow morning at 9:00

With ONE button. I believe I would use it all the time
thanks!

This review is for a previous version of the add-on (4.2.4). 

The user guide (http://blog.kamens.us/send-later/) shows how to set this up.

It does require some manual configuration, but I'm not sure how to avoid that. Everyone wants something slightly different from the add-on, and if I tried to make everything everybody requested point-and-click, the add-on would be too large, unwieldy, and difficult to use.