I don't mind paying for good software which is documemnted and fully supported. This is exactly that. It works well, and support for me has been very rapid - faster than any of the other commercial extensions I have. The older reviews in this thread suggest that the support experience can be nmixed, or uised to be variable, but it has been excellent for me.
It also comes with good documentation. I'm now looking at other 2J extensions: I've been impressed.