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I have the Mudman G-9300 (solar)
Its okay. Has a digital compass, thermometer, and the regular stuff like stop watch, timer, alarm, etc.
The glass is pretty scratch resistant if you ask me. Mine's been through hundreds of miles in all sorts of environments, the back metal has scratched, though.
No clie about the waterproof capabilities because I always take it off before I go in water. My older gshock (MTG520) died in water from a bad o-ring/rubber ring.