Not too pricey, and a fairly quick tour of the city (under an hour). It's a hop-on, hop-off bus…read moretour, but there aren't really many places that you want to hop-off. Only seven stops. They provide cheapy headphones for you to listen to the pre-recorded audio track if you don't speak German (which is blaring over the loudspeakers in the bus). Nothing really special, and if this is what city bus tours are like, I probably won't do any more in the future. They have a couple other routes to try, as well, but I can't imagine that they are any better than the main city tour that I took.
So here's the funny part: my wife was commenting that our driver was very aggressive, but I didn't really agree... until he rear-ended someone!! So that delayed us a bit while they worked things out...