I didn't need slideshows, lightboxes or fancy transitions. I did need a photo gallery that can be divided into categories and is easy to use. This extensions meets my needs. I had no trouble installing - the "welcome page" following the install tells you what to do next, including how to create the menu to point to the gallery, so it's suitable for beginners as well as more experienced users.
No need to create special folders on your server, or thumbnails on your PC. The config tab can't be changed without clicking the edit button, so you can't easily muck up your config by mistake.
Just what I've been looking for.