You don't have to be a Pro to use this application and I would agree that those who can't get it to work are unfairly criticizing this application. I had the opportunity to buy it for half price in a deal and had my first "creation" up and running on an iWeb built site in about 30 minutes.
While the method of getting it to work on your website is not exactly a no brainer, it doesn't take a rocket scientist to figure it out. I have outlined the procedure I used for getting a banner to run on a site built using iWeb '09 in a comment to the previous poster.
I do think that it would be hard to justify the cost of BannerZest Pro for use on on or two personal websites but, if you design for others, it is a useful application for quickly producing something different.