Definitely a great way to see some of the city where the buses don't go. Our tour guide was exceptionally friendly, informative and made the tour great. The ride through the English Gardens and along the river was awesome and she pointed out many sites and explained them in detail.
If you want to travel to Salzburg for a small trip, this is the way to go. The train ride was comfortable, and our guide pointed out sites along the way. Once in Salzburg, we toured with the guide for a while and then had plenty of time on our own. This is definitely worth doing.