2018.42.4 here.
I just finished reading this thread and wanted to share my experience. I just completed my 2nd long distance trip last weekend. Denver to Minneapolis and back. I updated to 42.4 the day before my trip. The drive to Minneapolis was pretty poor conditions - cold and rainy. I'd like to focus more on my NoA experience driving back to Denver as the weather was clear and sunny, above freezing, and light traffic - it's the boonies pretty much the entire way.
I experienced many of the 'beta' issues others have talked about here... but there are a few experiences I haven't seen anyone else mention yet. I Navigated to nearly every supercharger along the way. When on NoA, it would always suggest I change to lane #2 in advance as it should and i'd confirm. However, whenever the exit came - it would move right off the exit ramp on its own w/o confirmation (though it sometimes flashed for confirmation as it was in the middle of exiting). I actually liked that behavior though was surprised no confirmation was necessary. Other than that - after going the majority of the way in the Mild or Medium setting of NoA I found it was never suggesting lane changes in time as I approached slower cars (mostly semis). I would give it every opportunity - let it slow down to follow the semi for a minute or so - expecting a suggestion but i'd quickly get frustrated and do the lane change like w/o NoA. Eventually I changed it to Mad Max mode and it seemed much better at suggesting lane changes in advance in this scenario though not perfect. Perhaps it's related to my car length distance setting at 1? (I can't imagine what a distance of 7 feels like btw - though i suppose i'll try it out).
About 50% of the time as I passed exits while in lane #2, NoA would suggest a lane change to #1 (which i'd ignore) and it would quickly slow down 13mph. Annoying, but it would've been dangerous if a car was near me. I also had a similar experience less often when passing semis. It would freak out and putt on the breaks as I was passing them (no one directly in front of me). The worst experience I had was when it did this as I was traveling though Omaha and there was a car behind me but not super close. I recovered by stepping on the gas fairly quick - but these experiences are fairly jarring - even if you're being a very attentive driver - as I was. Finally, if NoA moved me to lane #1 it would never ever suggest I move back to lane #2 as you're supposed to. It would gladly stay in lane #1 forever - like annoying drivers.
I loved using Autosteer to stay nicely in the lines and Adaptive Cruise. However, my hands would hurt after a while due to having squeeze the steering wheel unnaturally hard all the time to avoid the nags. I can see how tempting it is for people to use some sort of cheat device to compensate.
Lastly - I met the owners of the supercharger contract in Gothenburg, NE while eating lunch at the restaurant they also own next to it. They picked me out as the owner of the 3 that was charging. Guess I don't look like a local, lol. Super nice couple (I'm horrible at remembering names). They showed me pix of when the Tesla Semi stopped by, the engineers eating at the restaurant and described the custom charging rig - no pix (4 cables that hooked into 2 superchargers I think - something like that). They have other Supercharger contracts apparently too - in Wyoming and somewhere else. They said the contract in Gothenburg was their first contract and they have to pay Tesla $1 per charge. The others they don't pay anything. They said they were the ones to seek out installation from Tesla Tesla didn't find them. They own the motel right there too (Comfort Suites). Definitely patronize the motel and restaurant - nothing fancy - but they're huge supporters of Tesla and solid people. She has grey spikey hair if you see her hanging around. Go say hi