I moved from mailjet to mandrill a couple years ago.
Mailjet was great, make sure you check'em out when you are doing comparsions.
Really sad about the mandrill change. Most of my projects I have no use whatsoever for mailchimp.
Best regards.
This tool will hopefully make my life easier. I'll still code everything carefully by hand but I have a hard time imagining how the UI will look like and I find myself spending quite some time coding and F5 repeatedly only to be disappointed by the result.
These thigs come with experience. I believe people that dedicate their time mostly to UI get real good and would not need a tool like this but for me I believe it'll do wonders.