The only issue I have with the mugs, is the trip to get refills.
In the morning, I need my caffeine fix, as soon as I wake up. Not once I am presentable enough to get to the food court. Sometimes it is a bit easier, just to have pop/coffee in the room.
We usually get a couple, but not for all 4 of us. They are nice when you are at the pool, or eating in the food court. They will pay for themselves fast.
I wait to see where my room is, before I decide to get them or not.