Fast forward 9 months, and I'm now using my Galaxy Ultra watch to monitor my blood pressure, and I've been able to reverse hyper tension thanks in part to how much of an improvement it has made when it comes to quickly getting the pressure reading.
Compared to the Omron I calibrate it against, it's a far better experience. It's also a huge step up in performance over the 6 Classic that I upgraded from. That one would have a failed reading 3 times out of 4, whereas the Ultra gets it right just about every single time.
The biggest pain is the monthly calibration process, seriously it feels like if I bat an eyelid, or not have the cuff on with just the right tightness, or just have the arm at a slightly different angle, or just get anxious about this whole thing, the Omron (a modern unit with built in Bluetooth etc) will give a different reading. When I get the process done right, however, the Galaxy will return readings that are very close to the Omron both systolic and diastolic - and then it's a month until next time.
Being able to quickly and easily get my blood pressure in a number of different situations made a huge change in my motivation to get it under control; I primarily focused on diet and exercise. I ran/run the test several times per day, and learned so much from it. Absolutely love my Ultra watch, it looks gorgeous and performs amazing in general as well.
Fwiw I'd regularly see values like 140-155 over 90, now I'm typically around 120 over 80 give or take.