I installed BigSur, upgrading from Catalina, a bit over 3 weeks ago. You can see my detailed first impressions here.
2 updates to that post:
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The current version of Carbon Copy Cloner creates bootable clones. The first run under BigSur will take more time as it creates the APFS System Disk from scratch rather than incrementally updating previous versions. I suspect that may also be the case when system updates are run. Shirt Pocket Software has yet to release a BigSur compatible version of SuperDuper, but is working on it.
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Often, after viewing a video (especially after viewing a full-screen video), no cursor appears on the screen. I’ve been able to get it back without restarting via various manipulations that don’t need the cursor, but I have yet to find any surefire algorithm aside from restarting the system