There's hundreds of people using these on public roadways. Check out the official Discord and the various Community Discords centered around it.

Over 1,000 people just today. A couple thousand every week.

In addition to running on a laptop, openpilot also runs on a phone for easy mounting in your car.

https://github.com/commaai/openpilot

Your FAQ says Comma "openpilot performs the functions of Adaptive Cruise Control (ACC) and Automated Lane Centering (ALC)" and my 2020 Corolla is supported-but it already has those features. I read through the site and I don't see the value proposition. Is it that Comma does a better job of it?