This stuff saved my freaking life on a backpacking trip. Totally changed my whole world. A cycling buddy of mine introduced it to me on a backpacking trip and I went from rashy, smelly, misery to menthol fresh, creamy comfort.
I took this to Yosemite on a 4 day trip where we had a total elevation gain of over 10K feet. Two other members of my group were wearing much more expensive Suunto altimeters. We all calibrated at the same spot and frequently compared altitudes. My Axio was always the lowest number and I was about ready to throw it in the trash until we saw a sign that said the exact altitude as we left the park at the end of the trip and my Axio was within 5 feet of accuracy while the other two guys were between 50 and 150 feet over. That was the only official sign that we saw that I chose to remember (since it was super accurate at that moment). I don't know if this is a situation of every broken clock being right twice a day or not. I plan on comparing it to a GPS next time