There are a number of things I like about this extension. First, it is very robust; you can use it to address a wide variety of requirements. I have used it to collect checklist data, in a reservation page, and to enhance registration. Second, the support is outstanding. I have answered most of my questions using the website or forum. Grayhead shares enthusiastically. And finally, I have learned a lot about Joomla extensions using this one. In appreciation, I bought the book; haven't used it yet but I'll probably get around to it.