Not yet. Not unless you have a spare Mac, hours of free time, and don’t mind ‘borking’ your configurations, says Daniel Eran Dilger.
From Hands on with Apple’s first public beta of macOS 10.15 Catalina, posted on AppleInsider Monday:
Note that most users should not download a Public Beta! This is especially the case for anyone who would have their life or work inconvenienced by having to track down complex problems, potentially including hardware that won’t boot or a full restore from a backup. That in itself can take hours to perform, particularly in our modern age where you likely have 100 GB or more of photos alone.
It’s not just that the Catalina Public Beta could have some wild bugs hiding in there as it develops—in our modern age of cloud-connected everything, even a minor bug could trigger a chain of events that might end up corrupting your Keychain passwords, duplicating contact records, borking your HomeKit configuration, or erasing pictures you expect to be synced to iCloud.
Let me emphasize this one more time: you don’t just need a solid backup before you install a Public Beta; you need the flexibility of hours of free time to sort out any problems that might result from using early beta software!
Ideally, to run the Public Beta you should have an extra Mac with a separate copy of your data, so if things go sideways you can erase it and start over fresh. Keep in mind that if you connect a Public Beta machine to your iCloud account you could end up tainting all sorts of your online data that could be complex to straighten out later.
My take: The definitive hands-on. Not for the faint of heart.