Ironically, the iPhone application offers much more than the standalone device. The GPS functionality automatically recognizes what ski resort you're at, worldwide, and downloads current snow and weather conditions, trail maps, and even what lifts are currently open. Even if your 3G network loses signal on the top of the mountain, the latest data is stored locally for reference. The GPS also keeps track of where you biggest jumps occurred, launching Google Maps to provide the exact latitude and longitude (it doesn't yet recognize the jump according to the trail map, but that's coming). Your top ten biggest jumps are stored, logging the resort, date, time, and of course your total air. The application will continue running until shutoff and doesn't drain the battery significantly. The only disadvantage of the phone versus the standalone model is the durability. The iPhone doesn't do well when buried in three feet of snow, and likely won't withstand a 25 mph impact against that tree that wouldn't get out of your way.