I want to make it very plain. I use Cocos2d and I love it.
Riq has done a simply amazing job of managing the Open Source project as well as the product itself. Without this framework I would have been forced to purchase a closed engine — spending big bucks and vastly limiting my real understanding of what happens under the covers.
There are many other contributors to this community project and their additions as well as support of one another make this simply the best decision I made during the design cycle of Joe Monkey.