[This review was collected as part of a promotion.] I got my S21 Ultra around 3 months ago and coming from a Note 9 definitely worth the upgrade in every sense. Then later bought a Led Cover and couldn't love more the combination. I can't speak about charging time because the first thing I do is disable fast charging (My Note 9 had the same battery performance and I bought it day almost day one), but the battery duration is really good, sometimes I go to sleep and work again without charging my phone (wake up in the range of ~45 to 50% battery). Adaptive refresh rate always enabled at full resolution. The only phone that can make me upgrade would be a Note 21 Ultra (or 22 Ultra).
[This review was collected as part of a promotion.] I bought this phone in Janurary. The itself has been fast, great camera, and screen. The biggest issue with this phone was the battery. Despite being advertised to last a full day, I could never get throughout my workday without having to charge the phone midday.