Stona review for PageFly Landing Page Builder

I experienced several bugs in my product pages, which were raised by my Customers - f.e. "Add to Cart" button stop working. The customer service has been always very good and I got very good support. I wish that the app would be more stable, the bugs are happening two often on my published pages, but still 4 stars because the customer service tries to give a very good support and fast response.