We loved this tour. There are 3 different loops the buses make that give you a real feel for the City. We used it to get the "lay of the land" and then to hop off and spend more time at some sites. There are headsets with many different languages. It was great.
This was a little disappointing. The cruise was pretty much just a shuttle between Salzburg and Hellbrunn. There isn't much to see from the river when you are past the old city.