I just got back from a 3500 mile tour on my XR650L, which included the Trans-Labrador Highway and lots of very rough paved roads in Quebec, Newfoundland, and Nova Scotia. It also included everything from serious dust to heavy rain to freezing overnight temps. My Oregon worked perfectly the whole time. The Powerlet power cable I was using eventually failed, but I had brought along the cigarette lighter adapter for my Tomtom GPS as backup (also a MiniUSB power plug) and a Powerlet-to-cigarette adapter cable; those kept the Oregon powered without issue for the rest of the trip.
I continue to be impressed with this unit.