It's actually just camera based. There is no LiDAR.
I actually have one and I like it pretty well. They're a bit more honest than Tesla about its capabilities and don't actually call it self-driving. They're very clear that it's adaptive cruise control + lane keeping that is better than most stock systems. You should be aware though that it's not really suitable for average users who expect a plug and play experience. Comma doesn't offer any software support at all, and there have been a lot of recent complaints about them not being very responsive to hardware warranty issues.
Waymo has proven to be far safer than human driven cars though. Sure, hold them accountable if they're really negligent, but some accidents are inevitable, but at a much lower rate than what human drivers cause.