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.
1. Having part of an add-on's management in the front-end is perfectly within the user interface convention of most XF add-ons. See the XFRM used to post this review. This claim is false.
2. It's perfectly possible to change the phrase used in the navbar tab, so the claim of "giant mailing lists tab" is false.
3. You can still navigate to the "dbtech-mail" route manually, so the claim of "you can't control your email lists" is false.
The author of the review also conveniently forgot to mention that when I told them they needed to input the HTML in the "Send mail" interface, they assumed I meant the mailing list description (???) and replied with a snarky reply stating their assumption.
With such a large amount of false claims in a single review, and the inability to understand that they can't come at a developer with an aggressive attitude and not expect pushback, I would be wary of selling add-ons to this person.