I own a Tesla and was offered 30 days of free full self driving. I refused to try it for a number of reasons.

• The routing in the navigation system has numerous issues like thinking it can’t turn left at intersections where you actually can. It results in less than optimal routes, and there’s no way to report those sorts of issues.
• FSD relies on the same camera system that Autopilot (traffic aware cruise control) uses. I’ve had Autopilot slam on the brakes for no obvious reason, swerve to avoid nothing, etc. If it has issues like that then chances are FSD will be just as bad.
• The cameras are also used to control the automatic windshield wipers, and they can turn on without warning in bright sun, etc.
• Same with the auto high beams, which are required by Autopilot & FSD. I refuse to use them because they can turn on & off a lot when there are cars approaching me.
• I regularly get alerts that cameras are obscured by bright sun, low sun in the sky, etc.

In other words, the systems that FSD rely on are clearly still buggy. So I refuse to use FSD until it’s clearly demonstrated the bugs in those systems are fixed.