Our client needed a picture viewer to show up in the site articles, and this was the only one I found that did just that...and gave me complete control in how it is used. So far, every question I have had has been answered by Andreas in the comments on his site. The documentation is clear and concise. The only people that might have a hard time with this tool are people that are completely new and don't know much about CSS or getting around in their file systems.
I only have one complaint...that I didn't find this plugin sooner! :)