It's fast. Really fast. I usually don't like OOP, but this one's fun. Actually, the only thing I can see "wrong" with it right now is the manual, which is well-written but dated. I think they'll get this one down, though.
They also underplay the value of the included source, which is just like documentation in its own right. It's refreshingly easy to read, and you will be missing out on a lot if you decide to overlook it.
Keep up the great work!