I've used Forms To Go since version 1.something and have always been very pleased with the developer's excellent support and obvious desire to make this a stellar product.

Version 4 adds the ability to reuse the original form html page as the error target, fully preserving all form entries. While his sounds like not a big thing, prior versions required a separate page for intelligent form error handling. This means only one common page to manage.

If you do any web development requiring custom PHP form handling (sorry, I haven't used the ASP or PERL scripts) Forms To Go will have a place in your workflow!