Originally posted by FozzFoster wondering what the quick procedure would be to making sure it's in decent shape.
Personally I haven't heard of any sample variation with the O-GPS1, I would suggest making sure it fits on your camera shoe snugly and check (and clean if needed) the shoe contacts of both your camera and the GPS unit, also check the battery compartment for contact corrosion or damage to the weather seals on the battery compartment.
Other than that, put a battery in it, slide it on your camera shoe,lock it down, turn on your camera and power it on: it should be fine.