FWIW: Got a 2018 M3 LR RWD. It came, by accident, with EAP. Two years later there was a sale on FSD and bought it. And early in 2022 I got into the Beta program.
Unlike the usual bunch of naysayers, I don't think that I bought a Pony with FSD-b, or even FSD: It's been clear from the beginning that FSD, especially the Beta, is a research project. The aspirational goal is to get to L3 or some such. So, expecting perfect behavior from this bag of software has always been out of the question, at least until Tesla is Done.
Having said that, I ponk around the landscape in full FSD-b mode all the blinking time. 98% of the time, it works; 2% of the time, and pretty much when not on limited access highways, it does insane things.
When first exposed to FSD-b in 2022 it required interventions once to thrice a mile. On average, with 11.4.7, it's more like once or thrice in ten miles on local roads, and Not At All on interstates. And, even with that, it's possible to make it 20 miles or more on local roads if the rolling dice cooperate. Doesn't happen all the time, but it does happen.
No question, though: On local roads, FSD-b is somewhat stress inducing, since one never knows when it's going to do something insane. But it does a lot of stuff right: Dodges around parked lawn service vehicles and dumptrucks, does reasonable right and, to a lesser extent, left turns; stop signs, light-controlled intersections, and all that. And it doesn't do seek-and-destroy on pedestrians and cyclists.
For long distance driving on interstates and such, FSD is actually stress reducing. No worries about running into cars in one's blind spots, auto lane changes are fine, it gets into most off and on ramps without trouble (although if it's tight with heavy traffic, it can get stuck.) 200 miles on FSD-b/FSD leaves one feeling a lot less beat up at the end of a trip than driving around without cruise control, or even minimal cruise control. EAP also does this fairly well, although not as full-featured as FSD/FSD-b.
Would I buy it again? Hm. I got it early on at $6k. It's $12k now. The SO has a MY; we did get EAP for it, which does have most of the goodies, at least on highways. I dunno: The SO says my investing in FSD was better than, say, me investing in a boat. Or an airplane. And probably cheaper, so she let me go for it. $12k is a little rich for that kind of fun.
Thing is: Tesla has said repeatedly that the closer to actual delivery FSD gets, the more Tesla is going to charge for it. And, when and if it ever gets to full robotaxi, then it'll be really expensive, like half the cost of the car. Or more.
Still, a fair number, low double digit percentage, of new Tesla buyers do go for it.
Your call.
