I have been using MailMinion since the company started and invited me on as a beta tester. As with any new technology company BETA is a period of growth, learning and building on issues that arise and I count myself lucky to of been there in the early days as I got to test it and run my email marketing campaigns for free in exchange for feedback.
Fast forward to today and MailMinion is a different beast altogether. It is by now in it's adolescence and coming along in leaps and bounds. Although right now MailMinion seems to mainly be for volume mailers like me it it seems to be quietly releasing new features on a weekly basis.
I am sure that in the coming months MailMinion will be pushing into the mainstream as an ESP that can cater for all businesses like Aweber, MailChimp and others.