I love everything about this plugin! It has a very user friendly interface, the instructions are precise and easy to follow, easy to customize to look and say exactly how you want it. I had no interest in using a newsletter for my site until I saw wysija. On a whim I downloaded it and did the 1-click plugin install (figuring I would most likely delete it).
I immediately fell in love with how user friendly it is and so easily customized. They do offer different newsletter templates, some are free and some are offered at a reasonable price. BUT you can also download one of their newsletter templates and make your own! It is also very easy to put your own logo & graphics on it.
I could go on for awhile about this plugin- but don't take my word for it. Download it yourself & you will see why it's so much fun!
Seriously.. even if you don't think you need a newsletter or have never considered one.. give wysija a try.. you'll be glad you did!