I put it on my iPhone 12 b/c I broke my old apple watch and needed a new one. Ordered the SE3 watch and didn't realize I had to have iOS26 for it to work or I'd have gotten an older one off Swappa.
It's been fine, had to delete my car from the phone Carplay and delete the phone out of the car b/c it was not responding on the car touch screen. Once I reset it it seems to work fine. Although the screen seems to want to display what it thinks I want instead of what I really want. Like it splits the Carplay screen up into multiple views, which is just confusing/cluttered. I just want one (like if I'm in podcasts, just show that, not Podcasts, phone and maps)
I don't see any battery issues. Usually during the weekends I use it more and it drains faster. Didn't seem any worse on Sat or Sun than a normal weekend. I did find a video online on suggested settings to reduce some of the battery drain and mostly followed that.
My only question is does Apple employ some of the dumbest people on the planet? The whole fiasco with photos on iOS18 and now with i26 they changed it again. With 18.xx at least you could modify it to make it a lot like the old photos, but this one you have to make a bunch of changes to make it similar to the user modified iOS18.xx version. I mean, after the huge outcry over them screwing up a native ap, you'd think they'd have learned their lesson and left it alone. I shouldn't have to go online to see how to fix an app to make it useable. Idiots.
I'm trying to decide if it's worth the hassle to downgrade back to 18.7, return the SE3 and find an older watch on Swappa.