This is a great extension that COULD trim hours off the time required to implement a Joomla! form. The feature list is extensive and should cover almost any need with little tweaking of the back-end code.
However, the lack of a user's guide and little built-in help results in a very steep learning curve. I spent hours in trail-and-error testing to get what I consider a simple form functioning as needed.
I give it a 4 rating only because I believe it is very good work. If there was a comprehensive user's guide I would rate this a 5+ and gladly purchase the 'no link' license for all of my sites.