I use the watch for a little less than a fortnight now. Previously I've had one of its predecessor models the GW-2000 for a couple of years. The GW-A1000 is a purely analogue watch, timekeeping is regular G-Shock quartz. It has the typical accuracy of a quartz watch, mine appears to be less than two seconds fast, in a rather stable environment though, ie boxed. The watch synchronzies to the standard time signals of five countries 'Multiband 6' sometimes confusingly called 'atomic'.* While the signals are localy restricted, they cover roughly half of the world population. The movement is also of the so called 'tough movement' type, which Casio claims would greatly increase its resilience towards high G-Forces. Equally important the movement is self adjusting, useful in case the hands are missaligned. There are various model versions available, but as mostly with G-Shock the differences are only cosmetic -- superficial and not worth to ment...