Excellent, its measurements are incredibly accurate whether we're talking about heart rate, altitude, sleep analysis, sound intensity, GPS step counting distances, etc. It has flawless communication with the device, never disconnects, the call quality is excellent, you hear and are heard perfectly. I have no complaints about the battery. Apple claims 18 hours. Yes, if you have EVERYTHING turned on. Personally, I have turned off various nonsense like the screen turning on with a wrist twist, detecting heartbeats every little while, and the most useless of all, detecting if you're exercising and what sport you're doing... It gives me 48 hours of use and still has between 10-25% battery left depending on how much I've used it. Excellent.

Very compatible with the iPhone. The battery lasts a day. If you have a small wrist, get the small size band.

I just received it, very nice overall if you like Apple products, just to warn that it requires a specific Apple adapter that is not included in the box and you have to go buy it.

I got it for my wife and I can say that it is beautiful and of course a quality construction. Immediate synchronization with the iPhone and seamless operation. The main issue is, as with all Apple watches, the battery, but you get used to it. Also, be careful with the size; the 40mm is for thin wrists, on larger hands it will look very small.

I love how I works with my phone
I also got a silicone transparent case so it is great and I can use it everyday whatever I’m doing!

Owner of a week, mobile 15 pro max definitely needs a case, but the collaboration with the mobile is excellent, battery one and a half days with everything open, a second phone in hand, excellent in measurements, I see no reason for someone to spend more money on other models