I upgraded my Linux Mint laptop to 20.3 today after my upgrade from 19.3 last week. It was very easy and took just a few minutes. I’ve only been using it for an hour, but so far, so good.
The new theme looks sharp and I like the rounded windows. I haven’t tried the updated apps yet and might not have much cause to. I am intrigued that they named the new document manager Thingy. I’ll have to give it a try just on that basis.