Could never adjust the driver’s side mirror wide enough to eliminate the blind spot, now it’s no issue at all.
I can only relate my own experience: I find it easy to adjust the Tesla side mirrors (and the mirrors on other cars I have owned over the years) to eliminate blind spots. The key is to realize that you don’t need to see the side of your own car in the mirrors. Set the mirrors slightly wider and you will be able to see the blind spot. You can check that by noting that, with the mirrors set correctly, you can start see a vehicle next to you in your peripheral vision (assuming yours is not compromised by a medical condition) before you lose sight of it in your mirrors. There will be an overlap.
That said, the Auto Pilot display area on the left side of the center display — which is always on — does a very good job of showing vehicles in your rear quarter areas. I’ve never seen that display miss a vehicle if it was there. And that is done primarily with the car’s cameras, not with the ultrasonics.
In my experience using Auto Lane Change, over the past several months, my car has never initiated a lane change into another vehicle in an adjacent lane. In fact my car is almost overly cautious when it detects a car in an adjacent lane that is gaining on me; it sometimes starts to make the lane change, crosses the divider line part way and then returns to its lane.
As Auto Pilot continues to improve (and based on my 5 years of experience, it certainly will) I predict that Tesla drivers will become increasingly confident in the system and use their side mirrors less. I still check mine before initiating a lane change, Auto or otherwise, and I turn my head just slightly to confirm, but I find Auto Lane Change works extremely well right now. It’s not perfect: but neither am I.
There is one situation that Auto Pilot is not yet really good at, and neither are human drivers: when you are changing lanes and a vehicle that is in the lane adjacent to the lane you are changing into decides to change lanes towards you, into the same lane you are moving into and that vehicle’s driver does not notice you are also changing lanes toward them. In that situation Auto Pilot may react in time to avoid a collision, but I don’t let it get that far; I abort the lane change since I am also monitoring the lane change.