Truly a fantastic and professional plugin. I created a wordpress.org account just to comment and thank these guys. This has so much for free and just works, unlike others I wrestled with for countless hours for email subscriptions to my blog (i.e. subscribe2, builtin woothemes subscribe, feedburner, jetpack, mailchimp).
Seriously true when they say "what you send is just awesome". Very impressed.
I would have paid for this even though the free version has more than what I need -- paid version is bit too pricey at $100/year. But then, I don't tend to try premium plugins, so I may not have even used it, or if more features were made premium at the expense of adding a cheaper option then I would not be so impressed with the plugin, so catch-22 for the devs. Perhaps just make the cheapest paid version a bit cheaper and I might bite ;)