I am continuing to install, monitor and use the Catalina Developer Beta. I just installed Catalina Beta 6, it is about 3 GB in size. The installation went fine. After poking around in Beta 6 I can safely say it is super fast! And, all of my mission critical Apps seem to work just fine. The Catalina OS is looking good. Keep in mind there are major changes in Catalina to how your macOS will work as previously mentioned.