Great product! It's European, I like it!
I bought the T5 for my employer (well-known humanitarian organization ;) ), and I use it with SMTP to replace transactional emails with Mailjet.
Currently, I use it to send reporting emails. The interface is simple, clean, and functional. I don't use the marketing part.
I also bought a T5 for personal use, as I do web development, but that will be for later :)
Keep up the good work, stay focused, you're doing an excellent job!
Mike