I come from a Huawei Watch GT2 and Suunto 7. The watch is very high quality. As is well known, it is a fitness-adventure watch and not so much a smartwatch. So it doesn't have a microphone or speaker for calls.
Build quality: Excellent, it's made in Finland and not China like the 7. Very good quality from the case and its coating to the strap. Choose the strap color carefully because the vertical straps cost 40€. You can use any 22mm quick-release strap, but it's not the same quality. The screen is definitely durable (the watch is milspec after all) but I put a screen protector on it just in case.
Screen: Very clear, bright with good resolution. Even when it's not lit and just sunlight or room light falls on it while you're wearing the watch, you can see the time normally. So you can turn off the backlight like I do and have it turn on only when you press a button, not automatically with movement, to save battery. When the backlight is off, think of it like playing on a Gameboy Color (for the old-timers), meaning you can see normally, but if the lights go out you can't see anything.
Operating system: Very simple and easy, it took me 3 days to get used to it because the Suunto 7 had 4 buttons and a different navigation method. The processor speed is perfect as advertised, it never lags. Keep in mind, when I first turned it on the watch was lagging in navigation, even though it seemed updated and I was a bit disappointed. Charge it and the next day when you wake up it will have updated properly and the watch works great. The Suunto app on the phone is top-notch as everyone says, simple and understandable. There are many programs but you can create custom ones via your phone, for example if you want to do something it doesn't have, you create a program so the screen shows what you need, e.g. heart rate, compass coordinates, etc. GPS accuracy, high map and compass response, barometer, storm and sunset warning that can catch you on your predetermined path, and the general feeling it gives you encourages you to go for a walk in the mountains and nature. The app on your phone allows you to download many apps to the watch, from weather and workout programs to an app for breaks between workout sets. Of course, the information you get from both the watch and the phone app about your workout progress, body condition and recovery, sleep quality, etc. is excellent.
Battery: I wear it all day, with gym workouts 3 times a week (not outdoor training so no GPS use), sleep tracking with oxygen and heart rate measurement 24/7, everything on and screen as I wrote above with automatic backlight off and low brightness. I've turned off notifications from the phone because Viber, for example, annoys me with constant alerts. There is no option for which phone app can alert you and which can't like the 7 had. And I don't really need it anyway, I don't need the watch to remind me of my phone addiction when I have it on me all day. The battery lasts 20 days. The 7 I had needed charging every day, so the battery seems extremely good to me.
Price: When it came out it cost over 550 as far as I know. Is it worth it? Definitely, but I would personally find it hard to pay that much for a watch. I bought it for €430 and I don't regret a single euro.
Sometimes it has a small bug, I press the button to turn on the light and it might take 15-20 seconds for the screen to light up, so I navigate without backlight. It's a silly bug that shouldn't exist in a watch of this caliber, 2 years after its release and at this price, but it happens about 1 in 30 times, which doesn't bother me and might even be fixed in the future.
Overall: I can't find anything negative, especially since I knew I was buying a top company comparable to Garmin (check out videos on YouTube, it competes easily and in some areas even surpasses the fenix7) and I knew it's a watch for adventures, military-grade, durable, that pushes you to get outside and move. So I don't mind that it doesn't have a microphone for calls, for example. I would buy it again with my eyes closed.
Why didn't I get the solar version? I'm not that adventurous to be 3-4 days in the mountains or at sea and need the watch to charge from the sun. Besides, 20 days of battery is more than enough for me, I would pay an extra €80 for no real reason just because it's a nice feature. Note: the solar doesn't charge the battery so much as it maintains it, resulting in it lasting over 2 months in full operation

On the positive side, the simple operation, relatively comfortable in hand, the large screen. On the negative side, which I would say are many after two months of use, the battery lasts two weeks at most; I thought from what I heard that it would easily last 20 days. (The 6x pro I had lasted 15-16 months.) I do 5-6 workouts a week and have everything open as I had it on Garmin. After the first few days of use, it decided not to connect to any heart rate strap or at least not to read them correctly, showing 180-200 beats during relaxation. Even with its own sensor, it showed the same. It fixed itself after I had tried everything. Once it was fixed, the infrared that measures heart rate, HRV, etc. stopped working; it simply measured nothing. It started working again with a restart. During a mountain workout, it did laps on its own at irregular intervals because that’s what it wanted! I created other mountain workout screens, and only then did it recover. Of course, I hadn’t activated auto lap. Another disadvantage is that for each workout, it lets you create up to 4 screens, which I think is a silly limitation. The price, €450 compared to Garmin, is reasonable, but if these teething problems don’t get fixed with an update, then the noise for another Suunto compared to the past is unjustified.

I've been a holder of the vertical for a few months now. My previous watch was the Suunto Race, which was very good as well, but I was a bit put off by the all-black color and gave it away.
In general, it does all the basics very well, excellent GPS, a heart rate monitor that works flawlessly for me even during intense interval running workouts, though it was a bit off during weight training!! Good maps, not with the details of Garmin, the necessary smartwatch features, and most importantly, a battery that you forget to charge, especially if you take advantage of the solar charging that essentially keeps the battery stable. Minimum of 15 days of use with 4 workouts a week and all-day use even while sleeping. During a 1:35 minute run, I lost 2% battery when on the Epix I was wearing on the other hand, the battery dropped by 12%.
Finally, the app has everything you need for settings, to create interval workouts, to create routes using the map, and generally has many settings for most of what you need.
In conclusion, it doesn’t have everything that a comparable Garmin has, like the Fenix 7x, but basically, 95% of users don’t need those extras, but it has the essentials for a proper user experience.
One of the best watches I have ever worn