Bought this for my Mum and she loves it. She syncs it with the Windows 10 app and loves looking at the stats history. She really enjoying tracking her steps throughout the day too. The heart rate monitor is a great feature to have and serves a multitude of purposes. The font size of the display is large enough for her to read without glasses and the OLED is vibrant and very clear. Battery life is phenomenal and lasts days before it requires charging. She doesn't have All Day Sync enabled and I presume this would help reduce battery consumption. She has an older Android phone that crashed repeatedly after installing the app so it had to be uninstalled as the phone became unusable. She uses the Windows 10 app and syncs via Bluetooth.