I would think you would have a better chance at getting your requests fulfilled if you checked in online 10 days prior to arriving than those that didn't. Disney would be able to review your requests that are in the system and block those set of rooms 10 days before those who didn't use the online check-in system. I can't wait to try it out myself to see how well this system works. Unfortunately, requests are just requests and no guarantee, but I could see this system working alot better than just showing up and hoping for the best.