I heard of the heart rate issues in a lot of reviews, but it just works on my (and my dads) skin. Its bad that it doesnt work for everyone though. I found a stupid workaround for background heart rate monitoring, you just start the manual monitoring and then close the app on the watch, which doesnt stop the monitoring.

We only had sync issues only on my dads phone, my phone (Fairphone 5 w. CalyxOS) works just fine. The issues on his phone were fixed by an Android update a few weeks ago.

Im happy with the battery, it lasts longer than a fitbit we have.

I dont think its a perfect watch, but for <50Eur with shipping its not bad