I bought a stainless Series 3 to replace my Series 0. Here are my thoughts: - It is amazing how fast it is. I actually find myself clicking on the complications now as it opens without delays. I put the reminders complication on as am using it more frequently on the watch now. Checking detailed weather is nice too - Battery life is phenomenal. Where I would be somewhere around dead to 20% depending on activity, I’m now around 70-80% - Screen seems a little sharper although not a huge difference. I do keep it at 50% brightness (default) - Taptic feels stronger. - It’s nice having Siri talk I’m sure there are other things but that is my 24 hour take away. I was thinking I may return if there isn’t much of a difference. I probably won’t now as it feels so much more useful now.