I don't normally choose bus tours, they tend not to be my favourite, but because the weather looked very rainy and I had two more weekends to explore Atlanta, I chose the bus tour as a way to get an overview of the city to help me decide what I'd like to do the next couple weekends (I was attending classes during the week).
This bus tour was excellent. We spent a quality amount of time at the Martin Luther King Centre and got an overview of other awesome sights (some of which I DID explore further later). It was the perfect way to get a broad understanding of the history and background of the city. If you only have a couple of days in the city, I would recommend this tour and using the CityPass to visit some of the major museums.