Does this software have a bad interface? As a Windows port it is absolutely hideous and suffers from all the flaws inherent in such a piece.
Is this software overpriced? IMHO, yes, for its current state of development.
BUT: this software has very flexible options and does one thing that none of the wget wrappers out there (and no other Mac software that I could find, correct me if I'm wrong) will do. This app is a gem because it will analyse java and pull out media that is hiding behind java pop-up windows or any other scripts. It's not perfect, however, and seemed to miss a file or two from quite a few directories of the site I tested. Right now I'd consider paying $10-15US for it but would pay the $30 if the interface was de-uglified and I didn't have to finish its job for it.