I installed this plug-in without much hope that it would actually work as many plug-ins are here, they rarely work "out of the box".
Instead, within 5 minutes I had configured it and sent a test mail. A few minutes more and I had my 2,700 email subscribers from feedburner imported.
What I like about this program is that it can be as simple or as complicated as you like. You can just use all of the default settings and templates or really get in there to make your own newletter's style.
This is such a VAST improvement over automatically sending an email with a photo, link and blurb (which is what feed-burner sent).
Now I can offer special content that only newsletter subscribers will see, add new AND old content of interest in the newsletter, add a personal message - and much, much more.
This script is very well maintained and the developer answers questions in his own forums within hours.
In short, I really love this plug-in and it made my website and all of my e-mail communication with my readers look more professional in a matter of minutes.