Very disappointed. Everything worked fine until the last week or so. Watch 4 was constantly disconnecting from my phone, eventually totally unable to re-connect. Watch was working fine and collecting fitness data, however unable to connect or communicate any information with my phone. I removed and then re-downloaded the watch 4 plugin app (confusing, btw...), and apparently nothing was backed up. I will ask for a refund if this happens again.. not worth the trouble and money.