I've been using DT for years. Even with all the ballyhoo accompanying OSX and its Dock, the appearance of a DT clone from a well known developer, the miracle launchers (LaunchPad, Quicksilver...), DT remains a key tool in my everyday work. While I also use the Dock and Quicksilver, DragThing is my essential program for organizing the desktop.
I download DT5.6 with the utmost confidence in the program and its developer.