I love the vivofit! I prefer these over any other tracker because of the watch battery and water resistance features. If you have to take it off to charge/fuss with it, what's the point. My last vivofit lasted a couple of years, this one is advertised to last a year. The app is easy to use. Buying through groupon was simple, it arrived in about 3 days and took less than 10 minutes to set up.