Be very careful! The basic plugins is done well and works with everything, then you will want to add the add-on and they will not care! They are not compatible with many of the plugins necessary to the structure of an e-commerce site!
Not for it considered profit inform of possible conflicts, when trying to ask for a refund ... warn you (after 20 days of request) that do not provide for the Add-On them you're screwed, because it is the only communication you will receive!
Simply they ignore you.
The expense is minimal, perhaps that are still active, and perhaps you would find thousands of negative feedbacks.
Their behavior is "paltry".
Perhaps they might wish to review feedback and ... what should respond to deny the obvious! I had the impression of dealing with a child who was a crest on spending!