Yes, we got them during our stay because we knew the number of refills we would be doing would make it worth buying. They still do not hold a lot after putting ice in first so each fill up doesnt last long. As a tip.... bring a container of dish soap and scrub tool to wash them out well after use. It will make them more pleasant tasting if you are using it for both coffee and soda.
Are the refill stations open in the individual 'islands' again? It was really convenient before when they were placed in all the different sections. It made it a lot more 'worth' while to get the mugs there.