Your service sounds too good to be true. I'm with Topica now and they're okay but I can't send my subscribers to a custom "thank you for subscribing" webpage once they subscribe.
I've been testing your service, and I really like it. I've tested many other mailing list managers, and yours is the best. I'm glad I found you.
I have to say that I love the service... I figured out how to use it and how to get it set up and before I even started publishing people started subscribing!! Very cool.