It's very convenient to observe the city with a pass. You can use it for several days and visit the most interesting attractions around the city. I missed Planetarium and Field Museum 'cause I did not find it interesting. But as for Observation decks and Ocenarium - I loved all of them. And the pass saves some money, too!
The most important privelege from this PASS is that you do not need to stay endless lines to enter any atraction suggested - like Observation Deck or Hancock Tower. We enjoied the FAST LINE and climb Willis Deck in 15 minutes instead of 1,5 hour for regular ticket holders.
I had an issue with my name on the voucher and the customer service was so helpful. He immediately edited it and sent the updated voucher to me. Thanks for a great service! I had a great time with the go chicago card eventhough i was not able to fully utilized it bec. Of time constraints on my part. Will surely use isango again in the future! :)