Just thought I'd follow up here again, now that it's been a few weeks! I've gotten a little more used to the most common mistakes it will make, and I'm enjoying the experience more and more. I almost always at least try using it on every drive, unless I know a particular drive segment is going to be really terrible based on past experience, or I'm too distracted to be testing.
I continue to be impressed by how well it works most of the time. I haven't had any strikes yet, or even come close to it. At least for me in my car: if you're vigilant with your eyes scanning the road, steering wheel nags are pretty minimal and easy to catch (I do tend to get steering wheel nags, because I habitually use zero force on the wheel and just sense the car through it, until I need to provide real input).
It has done a few dangerous things, but nothing I couldn't correct. I tend to let situations play out as long as I safely can just to see what it ends up doing. Sometimes things that look really fishy initially, it eventually will recover from without intervention and continue the drive, even though anyone observing from the outside would probably consider the driver to be crazy or impaired! After initially testing in the "Average" profile, I've since found that I like "Assertive" better. I've been the passenger-seat instructor/monitor while newbies throw their cars off the side of the track in high speed corners on road race courses before, so maybe that prior experience helps a lot in calmly handling FSD's behaviors
My wife hates it and is terrified of it, but sometimes tolerates me using it while she's in the car.
The most pervasive and high priority issue to me, IMHO, continues to be the horrible lane choice planning in some situations. It's clearly not paying attention to the map data about turn lanes, etc at all! Second to that, is the inability to override the navigation's routing (I now usually have to turn off FSD until I fully exit my neighborhood, just because it persistently wants to route me towards a road that is currently under construction - if only I could cancel out that road, or drag the path on the map at the start of the drive?).
All in all, still going great. Looking forward to 10.13 and eventually single-stack!