Very good! The only negative thing is the battery that runs out quickly and the fact that if you don't have a Samsung phone, some functions are not possible.

The best smart watch I have ever bought....and I have had Apple watch, Huawei and Xiaomi..... They all work perfectly, you can answer calls, messages, emails, viper, messenger.... you can download plenty of apps.... Other watches can't do all these things.....and even though their batteries last as long as they want.....They are not as accurate as Garmin for measurements but they are great for sports activities....after all, it's not a sports watch.... it's for not being on your phone all the time....and it does a great job.....

The battery only lasts for a day!!! Wifi calling doesn't connect, Xiaomi headphones worth 70€ don't connect either. If you're not a tech expert, you'll just waste your money because no one in technology stores will fix it or explain it to you!!!! A week of wearing the watch without working, only for household chores, and the case got scratched immediately and the warranty doesn't cover it because the scratch is not on the screen!!! I'm not sure if the measurements are accurate, but one night when I got up for the bathroom and water in the morning, it said I had taken 500 steps in a 70 sq.m. house!!!

Coming from the Apple Watch SE, I feel like I have reached a new technological level... wonderful watch... many applications, you can download whatever you want... excellent screen, very clear in the sunlight... powerful sound when you receive a phone call... the battery cannot last more than a day... because many sensors are working for the measurements it takes... and the others that last a week don't do the same... let's not compare them... Overall, this watch has improved my daily life... in terms of health issues and motivation for exercise... and you no longer look at your phone... it's worth buying...

Attention. If the watch is not purchased from an official Greek store (GR), you need to call Samsung to provide the IMEI to find out the first destination country. The country should be within the EU to have warranty and have the same LTE characteristics as Greece (good luck with that). Mine was for Vietnam as the first country, so I didn't have voice calls and warranty from Samsung, no. I had a decent watch that sent SMS and all the other good things it does, including the Bluetooth version. I returned it mainly because of the lack of warranty (read until the end though - maybe I didn't do well!).

P.S.: It worked! I paid a lot for information, so I will share it to save you the expenses: you need wifi calling for Cosmote. Ask the provider for that (it's free for a German).
And let me tell you about my experience. So, out of stubbornness, I bought it again from Samsung Hellas (eshop) at the inflated price of €370 (€140 more than the store here) and I paid another €5 to Cosmote for esim. The result was the same! I called Cosmote, waited for 60 minutes and hung up... I called Samsung and they made some settings through mobile remote control... Nothing. They suggested I try Vodafone because their website mentions that they support it. I paid €35 for a new SIM card and conversion to esim and... even worse, it doesn't even connect to the Vodafone GR network, not even SMS. I found a small German and tried to get some new information, and a guy wearing the watch5 pro lte told me that it needs wifi calling. He activated it, it kicked me out of that network automatically, the watch restarted and everything was fine!.. Conclusions:
1. Cosmote's customer service didn't find anything wrong and didn't know enough about the issues, in other words, the staff is not high-tech, they only know the basics.
2. Cosmote's website is inaccurate in the list of supported esim devices (you can find them all together if you google it), it doesn't include the Watch6 but it actually supports it. Of course, their eshop says that it supports it.
3. Vodafone has the device on their list, but it didn't work right away. I will come back if I deal with it and fix it.
4. Samsung suggested that I buy a second sim based on the above, and I wasted €35, which means they don't know either. Maybe I will call them for an update.
5. The Vietnamese watch might have worked just fine, I wish I had encountered a suitable employee back then, even without warranty. I would have saved €243. Now I paid a total of €370+€10+€35=€415.
6. Wifi calling is a technology that allows you to make calls through... wifi. The fact that it blocks the watch is a bug of Cosmote.

As a 4G device: I diverted calls from my mobile to the watch (either with *21*number# and #21# to cancel, or through the phone app settings), I added a VISA debit card to gwallet, connected the Xiaomi Basic Earbuds worth €20 via Bluetooth, left my mobile at home and went for coffee. I started with 95% battery, used Google Maps once to find a place, made two NFC payments, sent 2 SMS, talked on 4G with the lice for 30 minutes, and returned home after 7 hours with 24% battery remaining.