I have bought this as alternative to SendInBlue. They promise a lot of features, but none of them work. I tried to setup a test automation. It did not work. They needed 2 weeks to have the developer search for the problem. They asked me to setup a new automation. I did it and still it did not work.
TO resume: I (mis)used 2 days in order test the software for then setting it up with all the content. It was wasted time, as it did not even work with the simple test automation. So in reality it should be 0 tacos.

If you want to be a sparring partner in developing a newsletter software, this is your chance. In case you want a working newsletter software: do not buy Inbox!!!