The best thing about FancyBox it you can place your photo gallery anywhere or even add text to describe each image so people know what they are looking at without having them navigate away from their current location (which I hate when using other galleries).
You could also use this with an eCommerce website like Amazon etc where customers have added items into baskets but want more information before checkout - then show just one item per time which includes pricing details as well! If there was no way around not being able to click outside/on top of any links within my photos because these would open up new pages instead of keeping me right next door? It's very annoying if someone clicks something inside another tab while trying out pictures online or whatever. Otherwise great product though :) We were creating custom lightboxes / carousels full screen showing off our products' features including prices all ready made by us rather than doing everything ourselves.