Nice watch easy to wear but little heavy looks attractive it attract others by seing it wonderful .The GA-100 was inspired by airplanes cockpit dials, the GA-110 was inspired by car design ( speed dial, gears, and rear wheel suspension design features) . And the GA-120 is supposed to be inspired by motor cycle design ( outer dial resembles a disc brake, the dials is arranged in a typical motor cycle fashion and the intersect of the hands look like motorcycle gears) .
There is nothing wrong with the GA-120 series, it is just that the versions of the GA-110 that has been released so far is better then for the GA-120. So the GA-120 have been left aside. But if casio releases some even cooler versions of the GA-120 I am sure its popularity will rise. But it is strange that we have not seen even one who have bought it.
Me personally I like the dial layout on the GA-120 a little bit more.