Just to chime in briefly since it seems timely:
The phantom braking issue in 2019.5.4, 2019.5.15, and 2019.7.11 that I've had is *infuriating*. The car is very frequently displaying (on the MCU) encroachment into my lane by other vehicles that is not only not happening, but isn't even particularly close to doing so, and the car reacts accordingly (including highlighting [or lowlighting since it's darker during the daytime] the threat car). This occurs most frequently when there's a significant speed difference between my lane and the adjacent lane. I don't have the ability to correlate MCU lane and object display with what autopilot is detecting and reacting to (
@verygreen might be able to speak to this?), but what my eyes see and what the MCU shows are quite dissimilar, so it's reasonable to guess AP has a similar sight picture to what the MCU is showing.
When I'm in the HOV lane doing 45-55 and the adjacent lane is doing 15, and my car suddenly sets off the jesus beeps and drops the anchors because it thinks someone is merging into me (but isn't), it very much harshes the mellow, and the mellow of Autopilot is why I bought the car.
Now, that having been said? Am I excited to theoretically get into this early access program? Yes, because I am a software engineer and know how to give bug reports and actionable feedback, and I'm hoping I can actually help solve these problems if I have a framework for delivering useful feedback (not these BS verbal bug reports). In practice, though, I'm increasingly starting to believe that the EAP (newest definition!) will not be a panacea, as apparently the updates in the program are still very sporadically deployed to members via an opaque selection process just like we animals in the general public, and I have yet to hear anyone give any sort of information that gives me high expectations about delivering issue reports and feedback.