Good introductions to the City and nice cruise. Quality bus and audio. Note, the bus tour makes only one stop at Rock Church it is worth the extra 3 Euros to go in, but buy the ticket in advance at the pick up point to skip the line. It was only a drive by of other sites e.g., Sibelius Monument, Senate Square, Uspenski Church. That was fine with us as we were there for a week and we understood the nature of these tours, but just be aware of that when booking the short bus tour so you are not surprised or disappointed. If you have only one day, I'd skip this combined tour and go for the longer guided bus tour so that you go in some of those other sites or walk around others. They are worth seeing up close.
A good way to get a quick intro to the city, unfortunately the Rock Church was closed so we did not see it. This bus tour is different from the hop-on hop-off bus so if that is what you are looking for, this is not for you. The canal tour was ok, weather was cool and windy so we were unable to stay on the top deck which is where you need to be if you want to take pictures.
Although we had a little trouble finding the pick up location on the Esplanade, we did make it on time and had good seats for the tour. Having the headphones tell us what we were seeing in English was great and the stop at the rock church was appreciated. Definitely worth going inside for the three euros that it cost. The bus tour was an hour and a half and we had enough time to get to the canal tour after which was also an hour and a half. We fully enjoyed both parts of this tour as it was a good introduction to Helsinki.