Which band did you get? I've thought about upgrading my series 5 to an ultra but since it still works just fine I can't bring myself to do it.
Midnight Ocean. My main thing is swimming, so the ocean band made more sense... I forget which, but one of the others is supposed to be good in the water too.
My biggest problem was the battery, after 4 yrs, was toast... I'd go for a swim with the activity app running, get out and be down at 68% from 100% in 90 minutes... Have to recharge after I get home just to make it through the day.
I will say, the Ultra is a chunker. It is noticeably bigger on my wrist compared to the standard chassis with curved edges. It's not a complete deal breaker for me, but had I been able to compare prior to purchasing, I would have appreciated better the difference...
That said, the screen IS nice and I like the fact i'm not trying to touch a single pixel in the upper left corner to go back a screen...
So, tradeoffs.