Their site has many video tutorials on how to build their forms which will get you going quickly. Depending on your knowledge, you can have a lot of control. As a designer with some scripting experience, this extension keeps me from hiring a programmer which I can't thank them enough for.
1.5 version is flawless which I've worked with in the past. I'd say the 1.6 version has a few issues but this company is alive, well and will respond to your trouble tickets.