I found the support to be just as good as the code. Today I went to the developer's forum to ask a question and I got a prompt and helpful response (thanks Adrien!).
I would recommend AcyMailing to anyone who wants a full featured newsletter component and fast helpful support from the developer.
The developer Daniel Dimitrov was extremely also helpful in customizing how the extension works for our site.
I would recommend this extension to anyone who is looking for a great Joomla! comments solution.
I did have a problem with how my Jumi module was displaying. I posted a question and got a very quick and helpful response from the developer MarHaj. It turned out that my problem had nothing to do with Jumi, instead it was an html table alignment issue.
I am looking forward to doing lots more with Jumi on my website!