Rated 5 out of 5 stars

...you can be certain the product has earned it.
MailMerge is a deceptive add-on because it's simplicity to use masks a very feature rich functionality that I have only begun to explore. I have a couple of clients who are going to be even more delighted by MailMerge than I am, if that's possible.

This review is for a previous version of the add-on (4.11.0).