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I always use a Casio 5610, and for the military (and my motivation to get extremely fit to enlistI thought it'd be neat if I got something more accessisble.
Just bought a 8900-1, perfect except for the shine. An upgrade to the 5610 I think.
In case any g-shock fan is wondering by military personel wears the thick g-shocks instead of the square 5600s (6600, 6900, 8900, mudman, frogman, etc....) it is because of the light button, which is much more accessible on those models. Some of them also have bigger buttons, easier to press with gloves. The straps also tend to be better, with a double line of holes. Also, it may sound like nonsense, but the 8900 and some other big g-shocks have screws on the sides of the resin body.
9/10 recommend it.