With three levels of expertise covered in their user interface (Classic, Easy, and Quick modes), I started with the Quick mode and can't imagine why I would need anything more.
The flexibility to create forms of almost arbitrary complexity and features is simply awesome.
Controlling the layout of a form is a breeze (similarity is intentional), as is creation of multi-column, and multi-section forms.
PayPal buttons are adequately supported, email acknowledgement, and notification are very flexible.
For most forms, no scripting is necessary, but if you know a bit of PHP, the sky is the limit.
I was able to become well versed in the use of BF using only the Users' Manual, and the Community Forums.
However, I did buy a subscription to be able to take advantage of Crosstec's help desk. The support is excellent and the response time is quick. Though it turns out to have been a problem I should have been able to solve myself, I don't regret having bought the subscription.
These guys are very responsive and helpful.