There was an insane sale so I got the 44mm black version without the mechanical bezel. I prefer the cleaner look overall it's completely flat display wise. The 'touch bezel' is way to sensitive, you either get nothing or it zooms too fast but I'm sure it's got a setting to reduce the sensitivity somewhere.
It doesn't feel like WearOS. I hated Wear OS. The amount of times back in 2.x where Google Assistant either couldn't do a thing (sad cloud saying connect to your phone) or it taking more steps than using Google Now in Wear 1.5 (such as sending a text now requiring you to tap 'send' instead of it being completely hands-free in the past, and remains hands-free via Bixby and I don't want to lose that!) was too many. Wear 2.x lagged and had horrible battery life. On my Urbane I was charging it TWICE daily as it'd barely make it more than 4-6 hours STANDBY just with AoD on.
So my expectations were low anyway. I only got the Watch 4 to take advantage of the brand new sleep features that Samsung Health claims 'requires a Watch 4 or above' (not so sure why!).
So far, battery life mirrors my Watch 3 and Apple Watch Series 5. It goes all day, usually around 37-40% by the time I take a shower at 5PM, so I charge it during that time. Same settings, AoD on, all tracking health features on continuous, and Wifi on.
I love how they kept Bixby. Maybe I'm just lucky but it works far better than the Assistant ever did, and even if it spells something wrong it immediately corrects it and works 'Hi Bixby, show the home screen' produces 'glow the home cream' and it autocorrects to 'Show the Home Screen' and does as expected. Some of the 'assumptions' are hilarious but it always corrects and gets the intent.
I love how it doesn't look or feel like Wear OS. It feels like Tizen which I prefer. The app 'bubbles' are similar to Apple watch and a lot of the UI changes make it more like an Apple Watch or at least similar, and the Body Composition is hard to make work (too three tries before I got a reading, but my dexterity sucks and I guess you need to be as limber as a 18 year-old for it to work properly but oh well). However, unlike my Apple Watch, the ECG works. Apple kept giving me 'inconclusive' but both Watch 3 and Watch 4 give me 'sinus rhythm'. Apple still can't handle my higher-than-normal (but normal for me after having a real ECG done) resting BPM for some reason.