jNews Pro was even worse experience than I thought. Too many bugs and errors and their latest update still have bugs. It was good when there was no other e-mail components, but since few others available on the market, this has lost its name.
The support is really bad since a user always speaks to some representatives, and never allow you to speak directly to the developer. And if the bug is found, it takes a long time to be fixed (if you get lucky).
Overall, this is a bad one and I recommend not to go with it and try something else.
I have been using Joomla CMS for 2 years. Before AcyMailing software, I was using Acajoom Pro for one year. AcyMailing Enterprise is an awesome component and 10x better then Acajoom Pro or jNews Pro.
It works very smooth with Joomla registration. It hands all bounces nicely and it shows very nice statistics. The support is extreme great and every time I had a complain (and believe me I had alot of requests and complains) the developer went and change it for me and improved it right away.
Comparing with Acajoom support, which you never speak to a developer and just some representatives, plus you have tons of bugs that came in their new jNews software, I must say that AcyMailing is the way to go.
I usually don't leave feedbacks much, but this is one of the first experience that it was pleasure talking to the support. One of the best components on the market!