There is more information available at the Linux Mint site: [linuxmint.com...]

Updated 2 boxes so far. Things are good.

No more snapd though .. so you can say bye-bye to open source chromium (guess the boys over at mint are getting a little tired of google)
If you are really desperate for open source chromium (not google chrome) or Opera, you could always install the windows builds in wine.
Have apt and deb though, so you can always go to vivaldi as a secondary browser directly.

I was mistaken earlier ... There is a Deb write for Opera and it installs to Mint 20 out of the box

I've been running it on all my machines, including my dev box, since it was released. No problems at all. Opera also runs on it without problems.

I installed the xfce version on one machine (out of 5 local, all linux).

I can no longer manipulate files on local servers, as I can from all other machines. I cannot find a way for Thunar to share a folder, and I cannot transfer files by just dragging/dropping them between computers. Warpinator is not grown-up enough for serious use. I cannot change the colour of windows' title bars to make them easier to spot. I am not happy about ulyana at all. Shame, 'cause I need a ubuntu-based OS for a critical app.

Two of my machines run manjaro, which are fine. The laptop has just been updated to 19, again fine.

I now have to upgrade a Mint 18 m/c. I was going to install ulyana, but now I will probably persuade my wife to change to manjaro. If I can't change ulyana to work properly I may well switch it to Lubuntu.

@dstiles - LM19.3 will be supported until 2023 (based on Ubuntu 18.04). You might want to try that. You could also try asking about your problem with xfce in the Mint forums.

My laptop runs Mint 19 and I've tried asking about Thunar, with limited success. All the online info I could find about themes was either for pre-20 or obviously was grey title-bars.