version 2.x is totally unfinished

I am not happy to say that but the newest version of this plugin is very (and that means really “very”) buggy. The admin settings is complex but very unintuitive. The official pages are very outdated and are structured very badly.

But overall the basic functionality is working (creating a gallery or a album and adding photos to it). If your client is ok with the administration available only in English you can give this plugin a try.