I'm on my second Model S and in both it has worked well - within the limitation that you have to stand close to the car. I use it least a dozen times a week when parking/exiting my office parking space. It continues to work despite the current problems being experinced by others (hope I haven't wrecked it now).I was under the impression that Summon had never been a useful feature in the UK ... certainly when I had a trial of EAP and tried Summon it was hopeless.
For completeness I'm on 2023.26.8 and an iPhone 14 Pro.