Do you feel it's a wise idea for someone to install beta software on their
main computer?
If the work you do with Office is important to you and you don't want to take
chances with it, I'd say no. But that's me ... others may have a higher
tolerance for risk.
At the very least, you'd want to completely uninstall the beta before
installing the released version of Office, and even then you're taking it on
faith that a beta's installer/uninstaller is fully tested, which, being that
it's a beta, it won't have been.
There's also the possibility of corrupted documents due to subtle changes in
the way the apps store data, etc.
The release will have bugs. The beta will have more.
MS warns not to install the beta on a production computer.
There's a reason for that.