Hi, this is my sum up. I am thinking to refund.
Pros
Generous offer and his server works.
Most potential.
Cons
If you have a mistake is not posible to fix it. Not posible delete campaigns, not posible pause campaigns.
You can not manages contacts in bulk, just one by one. You have to import and import.
Not custom fields.
When you are designing a email or campaign, each time you update, push out and have to start again.
The UX is confusing and you need lot of time to do something.

I am still trying.