Why did it take this long for someone to come along with a newsletter component that just works the way it should? From the purchase to the installation, to the day-to-day use, this is the best I've found.
That's not to say there isn't room for improvement, particularly in the CAPTCHA (commercial versions only), which is not very configurable.
It would also be nice if you could easily change the dates of created newsletters. That feature would be particularly helpful for designers putting older content into a new site design, or even into an existing site with AcyMailing setup for the first time.
It looks like the developer is regularly updating this component, and I look forward to advances down the line!