You have a great product...I LOVE the form generator for collecting emails to put on my site. And the testing process it totally cool. Thanks for such a well thought out product.
I have been using Microsoft List Builder previously. You product is excellent. I will be cancelling my List Builder at the end of this month!
I have used quite a few different services of your kind, and I think yours provides the most value for the money of any I've seen. Great tool!