I've had the watch over a week and here are my views on the carbon fiber G (negative display);
Module The module number is 3159 with the following features;
World time with 48 cities and UTC. Four alarms and a snooze along with an optional hourly signal. Twenty four hour stopwatch. Twenty four hour countdown timer, adjustable by the minute or hour.
Multi-Band Six which means it syncs with six atomic clock radio siganls in the Northern hemisphere. Makes it accurate over a large chunk of the globe. If it doesn't sync, it loses and average of 15 seconds a month. Tough solar as well, so no battery changes or maintenance for the forseeable future.
All around great package with useful functions. In the time mode, day, date and time are displayed along with info. about the syncing. Time is not displayed in other modes, which is a minor pain.
Case A soft, rubbery plastic case with a slight gloss to it. The case is also semi-transparent which makes viewing the carbon fiber strap wrapped around the spring bars possible. Think Casio went with a non-resin case to keep it from rotting over time. The material Casio did use looks and feels good, but smudges occasionally. Just wipe and it's clean. No problems.
The back of the case and the buttons are titanium and are coated in PVD. Looks good but not as shiny as the coating on the back of the 5000 which shares the same module as this model. Nice coating and matches the negative dispaly well.
Strap The selling point of this model, the strap with carbon fiber inserts sandwiched between a transparent front layer and a gray, anti-bacterial back side. The carbon fiber is nearly tear proof which makes the strap almost impossible to rip off. Another anvantage is the light weight which contributes to the total heft being 47 grams. The anti-bacterial backside doesn't stink after taking it off at the end of the day. Has stayed clean for the week I've worn it, but too soon to tell if that will last. Overall, looks and feels good.
Some people have argued that carbon fiber is not needed on a G and that it is merely cosmetic, but I like the idea of the carbon fiber and the fact that it will not rip over time is added security. And it is pretty to look at
The carbon fiber makes the strap stiffer than other bands I've had but I just wear it a bit looser than normal with no problems.
Conclusion I like it! Good solid watch with an upgraded strap and one of Casio's best modules. Glad to see Casio experimenting with new technolgies and materials and waiting to see what other offerings there will be in the RM Line of G Shocks.