Well, since some of you have suggested (and pursuaded me) to buy a 5600 model, I've been trying to figure out what the differences are between the DW-5600, G-5600 and GW-5600.
There is plenty of information on these in loads of different posts, but since I'm new to g-shocks I thought it might be handy to summarize a few things.
Please correct me if you think that the information is not right, or if I've missed some important feature's!
According to information I found in several posts, these are some of the differences that are mentioned most often:
DW-5600: (module 1545 )
PRO's: Low cost. Displays both day and date at the same time. El lighting (DW-5600E only). Dual time ( vintage DW-5600C only).
CON's: Does not have Tough Solar technology. Does not have waveceptor technology. The countdown timer can be set only in one direction: up +. Does not have world time. Has smaller digits than the G-5600 and GW-5600.
PRO's: Has Tough Solar technology. Accepts strap adaptors. Has a large countdown timer and stopwatch ( both 100 Hrs). Displays both day and date at the same time. The countdown timer can be set by scrolling up + or down -. Current time remains visible in all modes except stopwatch. Dual time. Auto EL. Has large digits.
CON's: Does not have waveceptor technology. Is slightly smaller, thinner and lighter than the GW or DW.
GW-5600: (module 2924)
PRO's: Has Tough Solar technology. Has waveceptor technology (Us and Japan only). Shows world time in 30 cities. Auto EL. Full auto calender. Large digits.
CON's: Has a short countdown timer (60 minutes) and stopwatch (24 Hrs). Does not show day and date at the same time. Current time is not visible in other modes.
UPDATE: GW-M5600 (module 3063)
PRO's: Has Tough Solar technology. Has 5 band waveceptor technology ((US, Japan, Europe). Large digits, Day and date both displayed, Stopwatch 1000 Hours. Current time displayed in countdown mode. Tone can be muted, 5 alarms.
CON's: Has (still) a short countdown timer of 60 minutes. Current time is not visible in stopwatch mode.
The case size of the new GW-M5600 : 46.7x43.2x12.7mm /51.7
The case of the G-5600 is at 12,1mm and 52 grams slightly less chunky than the GW-5600 and DW-5600 which are 13,4mm thick and weigh 54 grams. Seeing the watches side by side it becomes obvious that the G-5600 has a slightly smaller bezel than the GW-5600. The bezel of the GW-5600 is thicker, wider and taller and has more of a square appearance while the G-5600 is more rectangular.
Some of you mention also that the GW-5600 looks better than the other models. There are also differencens in opinion about the band being more comfortable on one model or the other. The GW-5600BCJ (and now also a version of the GW-M5600) offer a composite bracelet.