I just got a FSD trial of 12.3.4 on my Model Y. It's better than I expected, but still feels far from something that can fully autonomously drive. Freeway driving works really well and has for years. Street driving is hit and miss. So much that I basically turn it off unless I'm driving a known good path. It handles intersections, street lights, and stop signs just fine. It goes around cars blocking the road, waiting first for a clear path in oncoming traffic.

On the bad side, it brakes REALLY hard a lot and accelerates REALLY hard off of stop signs.

It often freaks out when pedestrians are near the side of the road. My car came to a rapid full stop because some bikers were standing looking at their phones about 6 feet from a crosswalk. Besides being jarring and annoying, it pissed off and scared the person behind me. The car wouldn't have moved if I didn't disengage FSD.

It drove right towards a very low curb that suddenly appears in the roadway by my house. It's an old curb that sits maybe only 3 inches high but would definitely feel like a slam and maybe damage the tire if we hit it. I'm guessing it doesn't look enough like a normal curb to FSD

There are a bunch of small experiences just like these. I disengage nearly every trip and often at least twice.

12.3.4 is pretty good.

The pros are that I've seen very human behavior from it like speeding up to get through a yellow light and letting people merge when they have a turn signals on. It also slows down for speed bumps and avoids blocking 4 way stops if pedestrians are crossing in the far side.

The bad is hard braking and acceleration at stop signs and there are just some situations where it waits too late to brake and then brakes too hard.

Downloading 12.3.5 now to test it