DW-5600 was my first G-shock and bought it in a Target for around $30. It's no frills, does what most people want a watch to do without being expensive, pretentious and isn't like wearing a satellite on your wrist. It's the ultimate cheap, modern tool watch on a budget IMHO.
Some people don't want or need to spend a couple hundred bucks for a watch they are actually going to use at work, don't care about impressing others, and just need the time, day and date. As a critical care RN who has worked in critical care transport, intensive care and in the emergency department this really is all the watch I need, takes a beating, don't have to worry about bumping it into anything, can get wet from washing my hands often, can wipe it off with caustic sanitizing wipes without worry and if I lose it I can just buy another one.
I've also worn my in many firearms classes (handguns, rifles and shotguns) and this watch has never let me down. I've traveled to different states for these classes and if I lose the watch or leave it in a hotel it's no big deal and will jsut buy another.