I've had some quality time with my new GW-6900 now. Very nice watch. At first I thought I wouldn't like it so much but got it because of the module's functions (module 3179). Now, I think it's really cool.
Here's a pic,, the protector is not delivered with the watch:
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!
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.
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 dual-time functions are always very important to me. It is very nice in that regard because it has some 31 zones and 49 cities + UTC. There is hardly a watch that has more. It even has Kathmandu time (45 minute off-set). Also you can scroll backward and forward through the time zones. The last time zone you had selected in the world-time mode will be shown above the local time when you choose to do so. You will lose the day/date but get the second time zone displayed at one glance. You can choose between 12h and 24h mode and DST is freely selectable for each zone. When you are in actual WT mode you will get the date for the city you selected.
Unfortunately, it doesn't have a time swap function where it swaps between the home time and the second time zone.
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 four other buttons are easy enough to press but not outstandingly easy or comfortable.
It has four alarms and a snooze as many G-Shocks these days. Set on interval these may even be able to wake you up. Timer and stopwatch can both be set for 24h which can be handy when you want to check remaining flight duration and those things. The display is very crisp and easy to read if not as big as that of the 7700 or that of the Seiko SBPG001.
Again this is an atomic watch. Should you be in a zone where there is no reception it will run with quartz accuracy. Casio specs that as +/- 15s per month. Mine was about 8 seconds off after around 40 days of not syncing, IIRC. So that would be six seconds per month. Accurate enough for most folks, I'd say. If it syncs you get to the second accuracy, of course.
I bought mine for $85 and I think it is one of the best modules Casio makes. A must have for the G-Shock fan.
No time swap function.
Display slightly on the small side.
Awfully big and thick with the band ripples standing off quite far on a small wrist (over 7" will be OK).
I give it a 9/10.
NB: There is also a nice video review of this model here: https://forums.watchuseek.com/showthr...gw-6900+review