Good way to catch the Hop-on-Hop-Off bus, city transit and access to many sites bundled into one. If you aren't going to use it for multiple days or several museum trips you may get separate tickets for less...but this was definitely convenient. I've looked up similar bundles for european cities London, Paris, Amsterdam and they are a great option for sight seeing.
Great trip and the process was simple! We turned in our e-vouchers and got our Go Boston Card at the Visitor Center, from there we just showed our card for each activity. Boston is Awesome and 3 days was not enough, we can't wait to go back! There was only one activity listed where there was an extra step, and that was explained. Will definitely use this process again.
Go Boston card only has 9 stops, very spread apart. Long walks to get to stops. Not recommended if you have any problems with mobility or walking!