I think the idea has potential. Maybe you should rethink the way feedback is provided. If I understand the idea correctly, it gives the 'customers' a choice between two products. When doing customer research you should never ask suggestive questions, which is what you do when you ask "Which one of these do you like?". Maybe they don't like it at all, but they still need to make a choice. This leads you to believe that one might be better than the other, while both ideas/products could be bad.