I use the Pulse daily for 3 weeks. Because of its ideal size and negligible weight I carry him always (just plug in and forget) with me. It syncs automatically (once?) Daily with the iPhone. During the day, I never look at the display. The battery I had to reload once: after 10 days was an automatic warning message that the battery level falls below 20%. Crashes or malfunction occurred. Conclusion: informative, motivating, good hardware and software.