yeah i'd say its worth it.
when you get there you don't have to wait in the long check in line.
instead you go to the online check in line which is shorter and basically they expedite the process.
since they know around what time to expect you they can easily have a room clean and ready for you even if you come before general check in time of 3pm.
we used it for our recent trip and got there around noon and had a room immediately where as in the past sometimes we've had to wait hours for a room to be ready.