I like the fact that you can get an easy overview of everything that has been sent to your inbox. The fact that there is no limit in number of attachments or amount of characters per mail makes it very practical to use when sending many mails at once. Sometimes the system lags, but overall it works well. If you want to send large amounts of mails at once, Mailcloud is a great service. We've been using Mailcloud to send out newsletters. It helps us keep track of who we already contacted so far, and gives us a good overview over our mailing list. I like how easy they make it for you when adding contacts into different mailings or campaigns! It is so much easier than having to manually input all of those emails yourself. There isn't anything really i dislike but maybe if there were more templates available? If not that then just add them as soon as possible cuz once someone has been placed into one mailing or campaign their info cannot go back out again until after 90 days have passed.