I have an Alta. I like it because it tracks how far I walk in a day, which helps me keep my distances up. I read its "calories used" estimate but don't really consider it accurate, and I rarely download into the app. But I do like being able to see how far I've walked in a day, since the mile markers at the park where I walk my dog are kind of weirdly laid out and confusing (there are several paths, so I'm never sure which counts as which). It's absolute shit as a watch, though; I can't read the face of it outdoors/in the sun, even at dusk.