+Heart rate sensor - shows relatively accurate readings even during sports activity, which most other smartwatches have a problem with this, I guess there accuracy is almost like having a chest strap. A big plus for me.
+Navigation is accurate and I connected immediately, I didn't even have to wait, it takes longer to set up an activity than to connect to the GPS and route navigation is great, you just need to download the map to your watch. But it is only possible to have one map in hours, so if one goes for a few days e.g. hiking and in order to be navigated by his watch, he has to download maps on his mobile phone and update it.
-The weather is reset every day, so you only have the current weather in the clock, a few hours later there's an exclamation mark and the next day you have to connect to your mobile and the internet to show the weather in hours, which is a bit nonsense.
Measurement of blood oxygen saturation can only be done manually during the day and nowhere is it stored in the long term or in a graph, if one wants to see older values, it only shows when one last measured and what the value was and even that can only be measured if one is standing/sitting completely still and not moving, but the measurement should be relatively accurate.
The graph for the pulse oximeter shows only during sleep as a sleep analysis and even here you have to set approximately when you go to sleep, so unless you go daily at the same hour and get up at the same hour it is quite inconvenient. Because if you set a longer sleep time from 10pm to 7am and you happen to go to sleep at 4am, at 7am the device is already measuring the oxygen saturation in the blood, which is quite nonsense when the device still continues to monitor sleep and shows what stage of sleep it is, albeit inaccurately. (I'll probably try to set the sleep measurement 24/7 only I'm worried about the battery, it will shorten much more) And overall the sleep analysis seems to be very inaccurate, just when I play on the computer in the evening, while I'm in the time period as set, the watch shows that I'm asleep, but I can additionally adjust in the app that I didn't fall asleep at 22:00 but at midnight, which I would expect such an expensive device to be able to detect, when a cheap 30€ fitness watch did it relatively more accurately. (I don't know if I just have a bug in my watch but after a few hours of sleep, like measuring the saturation in my blood, the sensor doesn't keep up anymore so for a while I'm dead "sensor snoozing about" and then it measures correctly again: D, because relatively it measures accurately only after a few hours of sleep it starts to go wrong for a short time, maybe just need another software update)
I bought the watch because of the 4 functions: GPS, heart rate that's a 100% rating. But Sleep Analysis, Pulse Ox these other two I prefer not to rate here. therefore 3 stars.
+-So evaluation, as a watch/fitness bracelet with additional features with GPS and heart rate measurement, sport, durability, battery life it's my rating at 100%, but other features and especially features like that sleep analysis, here you should think about another device (maybe fitbit) when you want to track that too.