We've attend all three Coasterstock events with our three kids (now ages 8, 6, and 4). They have LOVED every single Coasterstock event despite not being able to take advantage of all the benefits (ERT).
Now attending Coasterstock is like a huge family reunion, as we have met the most wonderful people, which we happen to think is the biggest benefit of all. The ERT, swag, food, tours, etc. are all great, and doing it with hundreds of close friends makes it all the more memorable!