A big wow for this plugin.
First of all : the interface is clear and intuitive. In comparison with a lot of other plugins this is definitely a big advantage.
Secondly, the creation of a newsletter is easy. You can add free (html) text, social media buttons, blogpost, images etc ... Some more email templates would be appreciated.
And now for the next developments ? Some basic crm functions would be nice : add dynamic fields and basic clients/subscriber typologies.
One of the best plugins I know !