The strap attachment has become narrower, the straps from Frontier will not fit.
For ECG and pressure measurement to work, the Samsung health monitor (SHM) application is required. If the phone is not Samsung - this is a problem. Since the SHM app is not on Google Play. It is available only in the company store, which does not work on non-Samsung smartphones. Yes, you can spend time and make it work, but this is not what you plan to do when you get the "crown of technology". It is written in footnotes, but who reads them.
The bezel does not work in many applications, even in built-in ones.
The UI in many built-in applications is terrible - somewhere there are abbreviations, so that there would be no scrolling, somewhere on the contrary, very long sentences with a scroll.
Stock dials - no matter how you offend anyone, this is very "modern art", you won't look without tears.
Memory is cheap to the point of impossibility. What prevented me from putting at least 64GB - so that I could throw music there, since there is no eSIM. There is no need for fast memory, if you're really too lazy, microSD would be installed.
While setting up after unpacking - the battery went from 60% to 15. This is in about 4 hours.
Compared to the clock on Tizen, there was an application with a store where you could normally select watch faces. Since now they are all in googleplay - it is inconvenient to search, it is inconvenient to watch. So more or less an option is Facer or WatchFaceApp, but they have problems with displaying the current battery status.
Charging tablet - I liked the old one more - like a chair, it was more convenient, this watch can slip off and stop charging. And it, unlike the previous ones, is one-piece, if the cable is damaged, there can be difficulties.
The heart rate monitor in training lives its own life. It may stop reading, it may suddenly start. Implementing a notification in the program that the pulse is not being read would seem to be quite simple.