It's easy to use, it has great documentation with examples which is very helpful when you are just starting out or even if your experience level in JS/HTML5 development isn't that high yet! The only thing I dislike about this library so far (and there might be more) would probably have something do deal wth IE9 compatibility issues but other than those small things everything works well as expected from me at least :) Great support of cross-browser functionality too - no need anymore using jquery plugins like fancybox2 etc., all can work together now without any problems thanks to scrollerreveil :).