LAst tiem we went we had a split stay, so we did it for one. I can't see a huge difference, but the CM at second resort did make teh comment that it was much easier for them, as they have all your papaer work prepped ahead of time. I see no reason not to do it. I can't say it's a huge timesaver you still have to talk to a CM beofre you can go to your room, but it could easily save a few minutes. Teh online check-in line moves more quickly, but long lines don't seem to be a huge problem at deluxe resorts. Indeed,check-in at pretty much every resort has always been fairly prompt.