I have been using Acajoom News/Plus on websites of my clients for several years now and I am still happy with it (and my clients too!).
The support is great and swift. Could not find an update of Acajoom Plus for my own website and received it by email within a day!
What's left to say? I am familiar with PHPlist (not for Joomla) but Acajoom is so much easier AND more reliable.
Acajoom offers more then most of my clients can handle.