Well I bought a G-Shock Riseman a while back. Its a cool watch, but Ill admit I bought it cause I liked the idea of having an altimeter (*DISCLAIMER * im not a pilot or mountainclimber). Anyways since then Ive actually used most of the features
Timer. at home for for pasta and BBQ. at work, to make sure bone cement is still workable.
Stopwatch. at work for measuring hardening time of different bone cements.
Altimeter: This one hasnt gotten any legitimate use but I do know that my floor is about 60 ft above ground level and I like to watch the altitude change when im riding alone on the elevator
World Time: I had to call someone in L.A (watch purchase related) so I had to wait till they opened and then till the manager came back from lunch
Barometer: a friend was having a birthday party for his daughter the other day, it was going to be outdoors and they wanted to know if it was going to rain.....It was dark windy and cloudy but the barometric pressure was about 30.25 inHg so I said nahh it wont rain for a while...and it didnt they had the party and it only started raining afterwards...(the pressure dropped)
Alarm : not very loud but It lets me know when Im about to be late to work so I start hauling (gluteus)
Atomic time: set the punch in clock at work.
How have your G's been usefull?