The user interface for this addon is not good. Going against the user interface conventions of most XF addons, the main interface for sending emails is on the front end, not the back end, and in a publicly viewable navigation tab. Non admins can't mess with your email lists, but it seems strange to take up precious nav bar real estate with a giant 'mailing lists' tab. Sure, you can turn off the nav tab, but then you can't control your email lists, can you?
In addition to this bizarre UI choice, there's absolutely zero documentation, and zero instructions for getting this addon configured.
So if you forget that sending emails via this addon is controlled on the *front* end and not the *back end* (like every other xf addon) and then ask for support on the author's website, he's pretty much going to mock you. I was told 'familiarize yourself with the interface' (again, ZERO documentation, and expected settings are not where they would be in a normal XF addon).
So with this kind of convoluted setup, and the author's attitude when seeking support, I can't recommend anyone purchase this addon.