Easy to install and to configure. All you need is including (3 different light boxes.) In the support forum you find even more for free. Anyway, it's meant to show pictures in articles. So don't expect tons of fancy features.
The only reason why I didn't install it already earlier is the complicate looking demo site. Just a friendly hint. :)
As for the support, when I reported a little problem on the developers site he answered just a few minutes later.
So all in all it's a great extension already.
But from what I read on the developers site he is busy to add even more functions.