You shouldn't even think twice before purchasing the pass, I started crosschecking whether the pass was value for money and stopped after checking Lotte and Everland cause these 2 already covered the cost of the 72-hours pass! Great value for money and makes it more interesting and easy way to discoverunique places in Seoul! Went to lotte world, rented a hanbok, went on the eland cruise and rode bicycles near the han river!
It was also so much easier to book on trip.com that on the official website.