The good API documentation and use of the API, very fast response to support requests, good email deliverability. There's a lot of things I like and love about Emailit. Previously I'd used an AppSumo deal with Sendinblue, which subsequently became Brevo, but I think that the Emailit deal is far better particularly if you're willing to work with the API. Thank you George! In my opinion this is one of the very best deals on AppSumo.