My wife and I have had rides of 40-60 miles where the elevation reported by my 520 and her 500 are within 10 feet of each other in reported elevation-- a few have been the same to the foot. The solitary upside to riding in wind is brought to us by the barometric altimeter-- climbing and strong wind are both accompanied by falling barometric pressure. I have a ~40 mile out-and-back ride that I know for a fact is ~800ft of climbing (almost all on the return leg) but on a particularly windy day, I got credit for 1,400ft. For having to ride face-first into 20mph wind for 2 hours, I'll gladly take those 600 bonus feet.