Very convenient way to get around the city. The bus stops are right near all the other tour bus stops and everyone kept trying to get on our buses because theirs didn't come as often as the hop-on hop-off. This is probably the company with the most buses coming at the most frequent times. The guides were really friendly and helpful as well. Also, you can buy tickets for other attractions from the bus driver and you'll get a discount doing it that way. We did this for the aquarium.
This was pretty cool, and it was the right price. These are also commuter planes though, so nobody is really describing what you're seeing you just look out the window, which is fine. I really liked that they give you free donuts while you wait.