Many basic things are not exists in Mailercloud such as double opt-on, inderpendent lists, transactional emails.
You can't add one email to several lists, if you run different business that means that you can't have same buyer in both lists, they said to use tags, but this not usable. Also it means that if customer unsubscribes from one brand, you can't contact with him from another.
The templates are limited, reports poor.
All this features are in road list for more then a year. The product not changed, no any progress I can see.
I bought another system and I like it much more