(You may be sorry you asked this...)
So, I got the update on a Model 3. Decided it'd been long enough since I gave NavOnAP a good try, and it probably improved since then. Drove ~130 miles today with it.
Boy was I wrong.
Within the first mile of engaging NavOnAP with ULC, it starts a lane change from the left lane to the right. I look at the visualization, and out the window. Clearly a truck there. No way it's going to actually start moving, right? Wrong. It starts heading straight into the truck, route line drawn on the screen directly through the truck in the target lane, and the car is just happily about to smash into it. "F*** this!" I blurted as I jerked control back.
Ok ok. Was just a fluke. Will give it a go again.
Went alright for a few more miles. The car made a mostly sensible move out of the passing lane after a bit. It immediately detected a slower car a little ways ahead and started back to the left, making me look like a jackass, but, whatever. Was sane enough.
Get a bit closer to the car I'm overtaking, which is going maybe 12 MPH slower than I am... about to overtake it and BAM, nearly a full panic brake out of no where down to about 5 MPH slower than the car I'm passing. Luckily no one was behind me. The other car was clearly in their lane, nothing ahead of my car but clear open highway. Seriously, wtf...
I let it do its thing, and it phantom braked off and on the whole way past this car. It was comical. I'd get part way overtaking them, the car would slow down and get partly behind them, then pass again. The other driver must have thought I was drunk or something. Then, with the car being overtaken partially passed, the car is like, "Lane change"... again directly into the car in that lane that it is clearly aware of. It was pretty subtle and I actually didn't catch it until I was on the dashed line. Finally gave up and disabled NavOnAP, and got past that car.
About 10 miles more before the first interchange. The lane change decisions it made were okay... not the best, but at least didn't try to move into other vehicles. Few phantom brakes again... and only while NavOnAP was enabled. Tried normal AP for a bit without the braking issues, which was weird. While I did have phantom braking problems last time I did a similar trip with NavOnAP, it was definitely way worse on this newer version.
Btw, this is a different car than last time, too (newer). No hacks, root, mods, etc either.
Anyway, it tooks the interchange like a champ. Nice.
Gets back on the highway without much issue too, including the merge. Not bad. Oh, but it's still stuck at the interchange speed setting while full on the new highway now. I bump it back up to the flow of traffic with the touchscreen. Nothing, stays there. Use the accelerator pedal to override, get to speed, let off, full regen back down to 55. No errors showing, nothing. No clue why it wasn't following my set speed.
Disabled AP entirely, reengaged, and it worked as it should.
This leg of the trip went okay, and was mostly a longer straight stretch. The lane change decisions definitely need a lot of work. It was constantly switching back and forth for no good reason. Tried all four modes with similar results.
Was some random braking/slowing, even when no other cars were around. Super weird, and super annoying. And wasn't happening with NavOnAP disabled. Happened back to back a dozen times in a row one time while someone was behind me. The person sped around me, probably thought I was brake checking them or something.
Last interchange of that leg was a no go. It started to take it, then decided, "This is close enough" and tried to just drive dead center of the left white line of the exit... wow. lol.
The return trip was worse. Didn't successfully take a single interchange without intervention. Several more attempts to change lanes directly into traffic. And tons and tons of phantom braking.
I completely gave up on it about 10 miles from home and just used normal AP, which worked alright. It still doesn't like the 3 spots on I-40 where the newly redone overpasses don't have markings and tried to kill us at all 3, but okay. (psst... stock AP1 handles those spots flawlessly).
We get to the last exit and I'm like, "Ok, lets see what it does." and I tap NavOnAP back on. Starts out okay. We get into the exit (it splits after the first part).. it starts the charge to the right... we move partly into that lane... BAM, HARD LEFT!!!!. Car turned out of the correct exit lane, back into and past the other lane before I could correct it and get us back on the right path. Mind you, I'm letting it take this exit at ~20 MPH less than any sane driver would bother, too, and it still screws it up. Clear markings, unambiguous.
My g/f: "I'm never using this."
Suffice it to say, I'm not impressed. Figured I'd share this misadventure before I headed to bed.