Finally got it last night, jumping from 21.9. The new features (especially Summon and sound notification on lock) are welcome. I'm glad they fixed the backup camera delay. However, I'm tired of things breaking with every. single. update.
Walkaway lock was working completely flawlessly for me. I got to the point where I never looked back at the car to see if the mirrors folded because it never failed to lock. I enabled the horn honk on lock and the second time I walked away from the car after installing 26.3, the car failed to lock. Mirrors didn't fold, horn did not honk, doors did not lock. Yes, I used the phone key to get in the car, not the key card. Yes, walkaway lock was enabled. It simply failed for the first time.
I lost multiple Slacker favorite stations again, as happens with every update. Fine, I'm used to it by now and added them back. The difference this time is after adding the favorites back, they disappeared again the next time I parked the car. They've continued to disappear after each time the car is parked throughout the day. UI reset hasn't helped.
Maybe a coincidence, but my driver side view mirror failed to unfold after unlocking the car. I've had this happen before, as well as the mirrors not tilting back up when going from reverse to drive, but not for a few months.