Actually, I have a vivosmart 5 and I love it! No issues so far…I use the vivosmart 4 as backup when 5 is charging

I purchased thinking it tracks indoor activities and it does not.

The small screen is a nightmare. Its terrible for touch control which causes frustration. On top of that they think you would want to read text messages 1 word at a time on it! The app is ok but the graphs have no scaling ability so I guess you have to export it to something else. Battery life is like 3 days at best. Wow...they could have given a decent screen size and had a larger battery in one shot....too bad. The metrics are weird and I'm not sure i trust all of them. Its a pain to see your heart rate while your running, unless you pin the heart rate function, but then forget about watching your timing. Besides it will probably start the timing no matter what is showing. And then theres the screen...I can't display seconds on the screen unless i'm doing a timing. I DO NOT LIKE THIS THING