I had the 5, 6, 7.
The worst is the 7. Simply because as soon as I inserted the card to pay, now even to check the time it asks for the code! In the 6, it also asked but at the top of the screen it showed the time and date and asked for the code only when you went to pay! Whoever has the 6 doesn't go to the 7 for any reason.. if I had to say one good thing, it is the larger screen and more comfortable code input compared to the 6.. otherwise, not worth it.

It is very good, maybe better than a mask. The problem is that when you swim, it may fall off, so I have to take it off when I remember. But generally, it is unlikely to fall off during other activities. Overall, it is easy to use and easy to put on and take off to release steam in case of bathing with it.

I also had a problem with the NFC setting, the issue was resolved after I uninstalled and reinstalled the mi fitness app. I added the CURVE mastercard (Revolut card) to it, and now there is no need to change anything. It also accepts Alpha and National Bank as long as it is a mastercard

It does not synchronize at all with Xiaomi Pay in the Mi Fitness application. I have tried everything and even before reaching the point of adding my card, it gives me an error ..........!!!!!!!

Very good. Lightweight. The battery lasts with everything open. The NFC works great (for Ethniki for sure, I think you can only use Mastercard).

However, it has two or three software bugs that need fixing. I hope they will fix them in an update. It doesn't read the emoticons that people send you (it shows some boxes). It also doesn't notify you of video calls, so if you don't have it nearby, you have to be called as a regular telephone call to see it on the watch and then open the camera to video call.

Also, you can't end a call with an automatic message in all applications. It only works in regular phone calls. In messenger-type applications, it simply has a rejection option.
However, these things are easily fixed, especially on a watch that costs 40 euros, they are minor details.

It is a better mi band 6 nfc, with a larger screen, larger font, nice colors, Greek with official upgrade, the straps from the 6 fit (they are a bit tighter, basically better).
It is perhaps the most complete band of all today!!!
Again, you have to set Italy as the country and use a curve card to have contactless payments....
Have a great summer