Installation is very smooth, and the documentation is good. I've been using this for several months now, and I'm very happy with it. I've also installed a few plug-ins that relate to Phoca Gallery; one of the strengths of Phoca Gallery is that there are many additional plug-ins you can add that will extend the functionality of your photo gallery. Since I first installed it, there have been updates. Updates go very smoothly. All you have to do is use the "install" page in your extensions menu, and you'll get two options on your screen, one for a fresh install, and one for an update that will keep your current data intact. Even though it is free, the quality is such that I felt very motivated to make a donation to support the future development of Phoca Gallery.