Mine arrived today and it's a really great watch. As Till has covered the bases, I'll just add my particular pluses and minuses, particularly in comparison with my GW-M5600-1ER. Just for reference mine is a GW-6900-1ER. That was my point of contention. Even though it is based on the classic 6600 round shape, which I also have and like, I didn't like the three eyes. I can live with them now, given that they actually serve a function. It is definitely a big watch and if you have small wrists, like I do, it might look too big for your taste. Somehow I can pull off the big ones alright and this one is no different. Still, it won't fit under a cuff and it is not a great pairing with a suit, IMHO. The dial and bezel markings are discreet and not garish. Well done, Casio! Although the GW6900 display is more capable in some ways, some people may prefer the look and the straightforward layout of the GWM5610 display. The main digits on the GWM5610 are larger than the GW6900, making it easier to read.

In their favor, the DW5600 and DW6900 have “flash alerts” with a flashing display and buzzer for the alarm and hourly time signals. Also, the countdown timer is settable in 1-second, 1-minute, and 1-hour increments, rather than just 1-minute and 1-hour increments for the GW models. The timer also has an auto-repeat function. The third circular graph is mostly eye candy, divided into ten segments which turn on / off sequentially as an ersatz second-hand during the default time mode, making a 360-degree “sweep” every ten seconds. In stopwatch mode, the pie graph segments represent 1/10th of a second and cycle on and off accordingly, making a 360-degree sweep every second. Of those three models, the G-9000 is probably "wears" the smallest. As Watch_Geekmaster noted, the straps on the DW- and GW-6900 "gap" at the sides of the wrist for a lot of people. Even though it's a different model, there's a great picture of the problem in this thread: https://www.watchuseek.com/f43/skinny-wrist-strap-mod-less-strap-gap-more-flex-676089.htmlThe timer and stopwatch modes can be set to 24 hours, rather than the stingy hour long versions on the GW-M5600. I agree that the GWM is superior overall. But the GW wins on price and I also think it wins on looks unless you really want the watch to be as small as it gets. Plenty. It has Multiband 6 so it receives all the time signals in each country that has such a service. It is also solar powered and basically won't need a battery. There is a rechargeable battery in there and that should be good for 20+ years unless you put the watch in a box. Even if you have it just laying on a desk it will be good for a very, very long time. The lower rectangular LCD area displays the usual time, day / date, and other chronograph functions. One unique function: the ability to toggle the day / date display with the World Time (city / time zone of your choice). The one in the middle is NOT a DW-6900, it's a DW-6 600. It's a different module inside, but they use the same case, bezel, and strap -- which makes plenty of people happy when they restore their 6600 and find those parts are discontinued -- and they're also identical in size and shape.

The Casio GW6900-1 watch is compact in size, with dimensions of 53.2 x 50 x 17.7 millimeters, and lightweight at only 63 grams. It is made with high-quality materials to ensure maximum durability and is built with a quartz (solar) mechanism type. Although bigger that the GW-M5600 it still sits well on the wrist and is if anything more comfortable. One of the key features of this watch is its solar power mechanism, which means it is powered by natural sunlight rather than a battery. This makes it a sustainable option for those who are eco-conscious. The watch also includes a calendar function, which lets you stay on top of important dates and events. The watch on the left is a GW-9000, not a G-9000MS, but it uses the same case, bezel, and strap, so they're identical in size and shape. The DW5600 and DW6900 do not have world time, so there are no differences between the two models in that area. Other limitations are only one alarm, no option to turn the button operation sound off, and no adjustable afterglow duration on either model. (It should be noted that the alarm is a “multi-function alarm” and not just a “daily alarm,” which offers a daily, date, 1-month, or monthly alarm.) The dimensions and weight are slightly different from their GW counterparts at 48.9 x 42.8 x 13.4 mm and 53 grams for the DW5600 and 53.2 x 50 x 16.3 mm and 67 grams for the DW6900, though not enough to be very noticeable.I can see little point to the functionality of right hand eye which merely marks passing seconds. I suppose it balances the appearance of the display. The GWM5610-1 is more compact and slimmer (46.7 x 43.2 x 12.7 millimeters versus 53.2 x 50 x 17.7). It is better suited to those with smaller wrists and those wearing tight-fitting long sleeves. It is also a little lighter (51.7 grams versus 63). You can put it on your wrist and forget it’s there. Given the size of the watch, very good. In the absolute both the G-7700 and the GW-2500 are better; closer fit and more flexible strap. But it has the magic light button; a great ergonomic comfort. The light can also be set to stay on for a full 3 seconds which is much better than on other watches where the time is usually too short. The Triple Sensor works well as a general reference. The barometer is the most useful of the functions; it includes a barometric pressure trend graph. The trend graph can be toggled on to replace the weekday at the top of the LCD (displaying constantly in the Time Mode).