I'll use the watch to log runs, and then when I look on the app the app tells me I've run a different distance than what the watch told me. Also takes 30 attempts to successfully download the app. Also the second my fitbit gets slightly cold, it'll stay charged the entire run but right when it's time to end the run and retrieve my distance and pace stats it dies just in time so I can't read them (that's happened multiple times). Other than that it's a great piece of cheap technology.