Installed on my MacBook Pro.
I have to say beta 1 was SUPER buggy and caused me massive headaches... but each beta has gotten better and better and running my MacBook Pro on Catalina beta 4 is almost (*almost*) back to normal with better battery life, less crashes, and less times when the computer starts running hot/using up RAM while barely doing anything.
Definitely enjoying beta 4, can't wait for beta 5 and beyond.