The app doesn't work on all browsers and devices. Some functions are simply not visible. I tried also to customize the product and e-mail template, but it's terrible and never worked. I sent also my liquid code to the support team and they were not able to adapt to my store design. After a few days, I got the answer that they can't adapt. They're using their own styles and id's which makes it more difficult.
It would be a really nice app, but like that it's useless for me. Maybe another time when they update and solve those problems.