I got a dev unit (mac mini). It had beta 2 on it. We started the porting effort and had questions. Forums were the only place they said answers could be had. Never got any answers.
When beta 10 was released, it just wouldn't install. We tried for a week then saw a post on the forums that gave a hint about Mac-to-Mac reset of the firmware and general machine state. We had to upgrade another machine to Catalina to use it (inconvenient, but not a killer).
When 11.0.1 came out it wouldn't install and now the machine is a brick. We ordered a production mini with the M1 and it will be here in late December. While we sit with the brick and can't do any porting.
At every step we hit brick walls and had zero help from Apple. It was beyond frustrating.