As a tool for my non-technical clients, this is one of the best form creation products for the price I have found. It is straight forward and very user friendly... I have bought 4 licenses in the last two weeks for various customers.
As with any product you will have those that would like more then the product currently offers, such as multi-page forms, the ability to duplicate forms, etc. My suggestion is that as you develop these capabilities you offer them as add-ons for a price over above the current base product. That way you can keep the everyday consumer happy with the price and be paid for your on-going development for those of us that might need more.
Great product... highly recommend it!