Updating Catalina betas for me is a total mess, hard to update when one hasn't got a lot of free space, system reports available free space all over the place, for instance, I moved the installer to an external disk, deleted the original to gain....wait for it... just 1 GB, running the installer gave me the low on space warning, report free disk is always different from what Finder says, in shirt, a mess (Again, if you are low on disk space.
System also gets slower even when one has 10-15 GB left, never had these before.
The dev beta 4 is worse than the previous betas in terms of stability. Panic 6 crashes for a umcommanded reboot.