I mentioned I was going to sign up and report back, I will share some of my findings here as well.
Signup was easy, I had some issue adding my email accounts to the system. I sent an email to their support desk and got a reply quickly and was able to resolve my problem.
The domain I signed up with was just a spare domain name I was not using, so I'm not really able to test it that much as the domain does not get any email.
plalonde:By providing a link on your highest rated pages such as your home page you get 20 seats
Christian_SEO mentioned you get 40 licenses for a link, you list 20. I was offered far less for a link from my domain (which does not even have a webpage up actually). Not sure how clear it is, but I found this page that may explain it some:
http://mxguarddog.com/faq.how_many_email/
Basically no clear number of licenses are given for a link, everyone is different. They do have a testing page where I plugged in a number of sites (google.com, yahoo.com etc.) to see what different webpages would earn. Different numbers were given, so there is some calculator they have or something.
So far I like what I've seen (which is not much), but I will probably put a more important domain online to test it more.
Our office is not interested in using the service, we have a policy of not endorcing any product and placing a link to their service would be considered an endorcement so no go at the office.