The best part about this service is its ability to send personalized emails, which are more likely than not going through your target audience's inboxes because they're interested in what you have for them right now (vs mass marketing).
There isn't anything I dislike specifically at this time but it would be nice if there was an option of being able to see how many opens each email has had without having someone manually record all those numbers themselves. It might just take some getting used too as we've been using other services before switching over here with no issues whatsoever so far by any means. We were looking into different ways or methods outsource our communications since most companies offer cheap bulk rates when compared against quality communication providers like us who actually care about delivering high-quality content across multiple platforms - both online & offline media channels such as social networking sites etc., along with traditional print/newspaper advertising campaigns via.