Love, love, love this!
Tiny widget lets you capture the important fields - name and email - so you can start building a relationship.
Opt-in is nice; cuts down on wiggy email addresses.
The editor provides you with the basics for customizing the email itself.
I almost went with 4-stars instead of 5 because styling it is a little hit and miss.Took me quite a bit with Google Chrome developers tool to track down the ONE style option that was making me crazy.
Bumped it back up to 5-stars because it is so easy to manage.
One caveat: the email addresses are held in the widget menu. If you expect some traffic, it would probably be a good idea to go and export these to a CSV (Excel) spreadsheet on a regular basis. That is the backup method here.
If you're looking for just a straight-up grab-the-email plugin, you couldn't ask for more. Great, great plugin.