This plug-in does work for many, an has done so for over a year. "Compatible with CB 1.0 RC2 and above. Tested with Zoom Gallery component 2.5 beta 3" means just that. It has been tested with, and found to work with. The plug-in is VERY BASIC, not rocket science, and should work in most instances.
Like everything else in life... If your system, OS,CB version is too far from "norm" it may not work.