The best thing about Chaos Intellect is its seamless integration to MailChimp. I've been using it for several years now, and all my campaigns are perfectly integrated into our MailChimp account. It's easy to track everything, and there's also some great reporting features available. What I don't like so far are the layout of the dashboard (it doesn't look as clean as other tools). Also, it requires too much attention from your side. Try it out first if you're looking for an easy solution which will save you tons of time. We have been utilizing Chaos Intellect for a long while now, and I can definitely recommend it to others who want to use MailChimp. It has saved us tons of time managing our contacts, and we've never had any issues. We're saving hours of work every day which was previously spent manually uploading and updating contacts in different spreadsheets.