This is a very good extensions, very easy to use (if you have some basic knowledge of SQL).
I discovered it some weeks ago and I use it now for all my website and did about 50 charts with it.
And on top of it the support from the developper is excellent : I had an issue posted on the forum and had an answer within minutes.
This is my first posted review and I did it because I really think the developper deserved it.
Thank you again for this great plugin.