Did an unplanned upgrade from a series 7 to an SE3 today, I had 45 minutes to kill and wandered into the Apple Store. My series 7 had a 80% battery and was barely making it through the day sometimes. With the trade in it only cost £199.
I tried going from the series 7 to series 10 last year and didn't care for the new design so ended up returning the 10. I was waiting to see if they would reduce the bezels any on the series 11 but they did not so I found a refurbished series 9 graphite SS from Amazon for $250. I got lucky and the refurb was scratch free with 100% battery health so Im happy now. I was just going to get my battery replaced on my series 7 but when apple installed ios26 on it the battery heath magically went from 79% to 82% so they wouldn't do the battery replacement.