Have seen some of their work, and liked it very much. My take on their work is as others mentioned - it's just what they are interested in. It may seem like it is the same, over and over...but I for one am glad they are doing it. One might wonder how many of the subjects of the photos are even around today - if gone, then these images become more important, if in need of repair today, the photos can aid in putting a building back into it's form at that time. Or maybe they just like what they shoot.