Geez, their site is so... umm, umm, "plaid jacket and white bucks." Their claims are pretty all-inclusive, aren't they? That is, if you can ever dig through all the marketing hype to actually read their claims. No, I've not heard of mailloop, but you might take a look at this thread, too: [webmasterworld.com...]
My dad just bought Mailloop for me, it is from Corey Rudl of MarketingTips.com. The program is OK with a high learning curve, documentation is insufficient. It seems like a powerful tool but I am still getting up and running on it. I am new to this kind of program. Sign up as an affiliate first and you will save alot. Corey does offer a lifetime money back guarantee without question, he tries to make all his products risk free to help sales. Give the demo a run.