We've been limping along with another newsletter component for a couple of years now and this extension is so refreshing! It opens up a whole new attitude toward our newsletters and their possibilities.
I've also looked around the AcyMailing forum and find that the product support is excellent as well. I've not yet had to use it because the component is so well built but it is clear that, should I run into something, my problem will be addressed and any issues resolved promptly. And they will kindly and professionally tell me if I've done something stupid.
If you are looking for a newsletter solution complete with styling, integration, statistics, ease of installation and incredible support, you have found it.
Many thanks to the AcyMailing Team.