I bought this product to take on holiday to the Alps, it worked well staying dry while riding through so very heavy rain storms. However once we started travelling through the mountains a significant weakness became apparent. Because the unit is water-tight it also appeares to be air-tight. When at altitude the touchscreen expands away from the display making inputs impossible until you have equalised the pressure by opening the usb cover. Then when you have decended the touchscreen is pushing on the display creating spurious reading and errors. All this is very frustrating as you will have to stop to rectify the pressure difference. Shame because apart from this problem it is a good unit, my friends Garmin suffered no such problems during our trip.