We used the online check-in in January, and it worked great. It was easy to do online. When we got to the hotel, the actual check in process there took two minutes (great for our plane tired kids), and our room was ready for us even though it was before check in time. Now, they don't guarantee your room will be ready for you early, so don't get mad if it isn't, but I'm guessing it improves your chances. Our bags arrived later, but we were able to drop off our carryon and head out to the parks. It is quick and easy to do and costs nothing, so why not save some time?