#1) It uses com_content, so all the extensions for articles work here. Nothing special required. Very important feature.
#2) It splits form design and article layout into 2 functions. This means you can have your users fill out easy forms without using the WYSIWYG editor and the problems that can cause. i can then style the layout for the article sing CSS, plugins, etc and make the article beautiful and consistent.
3#) It's easy to use. Some of the other CCKs are powerful but very difficult to figure out how to use. F2C is well documented and simple to use for both admins and end-users.
#4) Good support. I had problems downloading the Pro component and Patrick was very responsive. This was on a weekend too.
Try this out and I think you will agree. It is a perfect combination of power and simplicity, all wrapped up in a standard com_content article!
There are already several donation extensions but this is the only one that goes past the basic PayPal button.
Sophisticated donations is an area that is really lacking in Joomla and Joomla Donation is quickly filling that need with real features.
The focus on community integration is excellent as well. This is much needed, and with JomSocial and CB included it should find a wide audience.
Keep up the excellent work! You have a customer for life as long as you do!