I've been using Joomla! for just 3 days now and wanted to incorporate a subscribed Newsletter feature. This evening I spent some time looking at newsletter solutions available here, and having viewed several of the available demo's, NS Pro was the obvious choice. It's very easy to use, feature rich and produces extremely professional results. It's also a fraction of the cost of some of the alternatives which provide less functionality. In the space of 20 minutes I have downloaded NS Pro, installed it on my Joomla! 1.6 environment, configured it and sent my very first newsletter (albeit a test to myself). I would certainly encourage you to view the demo of NS Pro, you'll love it!