This is the form plugin that tops them all in terms of pricing v functionality. It is very easy to use and gain professional results. Moreover, the array of possibilities, even for a novice like me, seem endless, yet easy to achieve.
The plugin itself is most worthwhile, but what makes it especially awesome is the high level of support offered. Not only do the WPNinjas respond to your every query, they do so extremely quickly (often well within the hour - or less - that you asked for assistance). More to the point, it seems that there is no question that they will leave unanswered: my experiences to date have been dealt with by Kevin Stover and I have to say I have never enjoyed such wonderful, pleasant and extremely helpful service in any sector (not simply in web design).
The new version (2.0) is a huge step forward from what was already a very impressive plugin and the extensions are all worth purchasing (free to those who purchased the plugin in its previous version).