I have found the display on this to be very small. In sunlight it cannot be read at all. The heart rate monitor is spot on as l compared it with a medical professional doing HR and it matched exactly. The steps seem to be way off but might have to tinker with step stride but seems to come up with a pretty big variation over stating steps. The fitbit app was just ok. I had to upgrade to a premium account to get the sleep info i wanted. The app is great for logging food water sleep and movement. Battery lasts for ages. Find it a little uncomfortable after a while just gotta take it off regularly so I put it on to charge at this point. Would opt for a bigger unit next time.