The extremely slim and lightweight design is really what sets the GW056A apart

The extremely slim and lightweight design is really what sets the GW056A apart. In terms of features, you'll notice that it's on par with all my favorite G-Shocks: Atomic calibration (US and Japan). Solar powered. Shock resistant (naturally). Water resistant to 200 meters, or about 650 feet. Automatic calendar. Electroluminescent backlight with auto EL function (meaning it can automatically illuminate when tilted to about 40° in the dark). World time (48 cities, 29 time zones, and automatic daylight savings adjustment). Four daily alarms and one snooze alarm (which keeps sounding until explicitly disabled). Countdown timer (up to 60 minutes). Stopwatch with split time (resolution of 1/100th of a second, and a maximum time of 59:59.99).I've owned my GW056A since they were first introduced in Japan about two years ago (which means mine is actually a GW056J — the identical Japanese version), and it still gets regular wrist time. I like to wear it in the winter because it fits nicely under my coat sleeve, and when I ride my motorcycle since it slips easily beneath a glove.Multi-step ascent rate indicator.Battery power monitor and warning function so you don't find yourself diving with a dead battery.Glass face, metal/composite housing.Metric or imperial units for display.Bitmapped display capable of showing graphs as well as numbers and text.Up to 240-hour profile and logbook memory.Unlike a lot of dive computers, the D4 looks more like a general outdoors/fitness watch, and would even be very reasonable as a daily wearer. I really like Suunto's use of bitmapped displays; as with the X9i and Lumi, they let you convey a lot of information very clearly, as well as graphs, big numbers, and so forth.Street price for the Suunto D4 is around $500 USD, and should be available any day now ("early 2008").