It's an amazing watch overall. It lives up to the high expectations. It's one of the best fitness trackers and overall health wearables out there. I tried Fitbit, Amazon Halo, and some others from Kickstarter/Indiegogo. If you already have a used one, no need to upgrade, but if you you are looking for your first Apple Watch, this is a great one. Don't buy below model 4 as it is too small and only 32-bit chip technology (outdated). The series 4 is great and does HR and ECG/EKG as well just like the 7. The 5 adds an always on display. The 6 adds the blood oxygen monitor, which I find fairly inconsistent and inaccurate as compared to an FDA approved finger pulse oximeter. The 7 is slightly larger. Otherwise they are all the same regardless what Apple is claiming/marketing. Personally, I would stay away from the SE models. Everything else is very minor and does not really make a difference. It's still not a world watch (no global LTE) and you still need to charge it EVERY SINGLE DAY. That said, as a health and fitness enthusiast, this still is essentially the best money can buy if you are on the Apple eco system. If you can afford it I would opt for the stainless steel option as it is much more scratch resistant and has the harder sapphire glass. The watch will look better much longer and that is totally worth it over time. The Aluminum gets dinged and scratched way too quickly.
