The modules are available only to members. Customers who bought the pro version have been transformed to members (so they now can download even the comment plus plugin).
Actually I’m using Newsletter 3 on every my blog, I pratically dismissed the pro version BUT when I found a bug it’s easy for me to patch it on the fly.
Anyway the follow up and reports modules are stable, and even the sendgrid. The feed by mail is stable for new installation, there could be only few little issue for who migrate from the pro version (if that module was used).
Stefano.