We loved the commentary of this tour. It was very informative and made our drive so much more interesting. However there was a bug with the app that made it frustrating. I am using an iPhone 5 and sync the Bluetooth to the car sound system. Each time a commentary would open to play, it would trigger my iTunes and start playing the first song in my iTunes Library. I would have to stop iTunes and press play on the commentary. We tried multiple changes with the phone settings but could not make this stop happening. The tour is so good I went through the hassle to hear it anyway. However if you were driving alone and had this same bug there is no way you would be able to manage the pause play and drive. This only happened when we were driving and the commentary comes up automatically, not if I am manually listening to the tour from my room. This same thing happened with all three of the Banff tours we downloaded.
Berkeleyhippie about Icefields Parkway GyPSy Guide