Seems that you are referring to a different plugin since we don't have a "complete survey" before downloading and in the product description is clearly stated that the form builder isn't part of the free version. The free version includes a classic booking form + the booking calendar as mentioned in the description.
If you find anything into the plugin description in this directory (referred to the free version) that doesn't match features of the free product we will fix that immediately. If that isn't the case then I feel that the 1 star review is just about the existence of a pro version with more features instead about the features already present in the free version.
Thank you for your comments!