We ran into a couple of little glitches with the RapidFill system, but nothing major. I thought overall it actually worked really well. I noticed that some people were slowing down the process waiting for an OK before filling, which isn't needed or given, but I'm sure as people get used to it we'll see less of that. And although I expected the time between fills to be an issue, I realized that at this point it won't be for me... my 2min chug refills always seem to be iced tea, not soda, and the tea machine isn't on the system yet (and might not ever be - I doubt it is as attractive as soda to mug-reusers).
The one thing that bugged me about it is that the values close down half the refill stations about an hour before the food court closes for the evening, something we were well aware of from past trips. But because the new system takes longer per fill and limits how many people can use the machine at one time, it seemed like there was always a backup waiting for refills in that last hour. A couple of times I opted for tea rather than wait in line for the soda machine.
I just wish they'd change up the mug design already. I could use the pool scene mugs for Christmas dinner, I have so many of them now!