I like that it's easy to use, especially when working with multiple people who are not designers or developers (which we're trying out). The UI could be more intuitive if you have no previous experience using this kind of tool--it can seem overwhelming at first glance! We've been able to prototype our website quickly without having an actual developer involved by simply creating prototypes within canvas flip itself instead of coding them up ourselves which saves time as well since there aren't any bugs once they go live.