I still love the color tones, the dynamic wallpaper, the icons are miles ahead of Yosemite-->Catalina IMO, and I have not experienced any crashes. In my case (MacBook Pro 13"/Intel i5/Intel Iris Plus Graphics/8GB RAM/250GB SSD) it's far more stable than Catalina. Catalina had a ton of broken/inconsistent features (random CPU usage over 99% on all four cores, dark mode was completely broken in auto mode, it took a minute or two to wake from sleep, etc) and Big Sur Beta is a huge improvement. If not for seeing screenshots of the update I wouild have never installed it. I'm not big on updates as they often break stuff or make things look awful (ever since flat UI became a standard, I've hated it--not to say there aren't excellent flat designs, such as the modern Hulu app, the Apple TV interface, Apple Watch, but most are tons of whitespace, and an interface that resembles Windows 1.x or Amiga Workbench 1.5, or Tandy DeskMate from the 80s) so I thank the forums for keeping us informed. First time in a long time I've actually liked an update--last time was probably iOS 6 on my iPad 3.