OK I'm cheap! I downloaded the free version which, I'm sure, is lacking some great features. But it's also given me a good opportunity to evaluate the extension. It rocks!
I tried the Easy mode and it sure was - though without a lot of control (obviously!). The next level was still simple but with more control over the form. The expert (I think it was called) mode - the most flexible - is still a breeze to use. But, for me, the biggest plus was the pixel perfect ability to specify field/text locations. So many form makers limit you to one field per line. This is how it is in easy, but in expert you can have as many per line as your site will allow width wise.
Easy to use, yet flexible and powerful - a great extension!