The extension is great and just installs out of the box without changing files or manual hacks. The plugin does all the work.
The layout is so good and clean, merges with all kinds of templates without changes.
Even if you need to change something, the code is so well written and commented, you'll find everything you need without much studying.
I needed to implement some extra features and the support not only replied within minutes but also they took the trouble to make some changes for me. The extension is very good but the costumer support is out of this world.