Yes I did, when you are spending that much money you don't want to discover there is some design flaw that makes you hate the car.
I was already sold on owning one so it was more to see what I potentially didn't like and could I overcome it.
What is funny is on the test drive the air suspension memory demonstration did not work and summons was temperamental....sales guy told me it'll be a software glitch, they'll fix that


However a person I know test drove a P100D after I said how happy I'd been with mine and although they were blown away by the drivetrain (as we all are) they did not purchase one for two main reasons.
1 - He felt after sitting in the car for 30 mins it felt like he was in a car that would have cost 1/3rd of the asking price.
2 - He needs reading glasses but cannot wear them for driving, without his glasses he struggled to use the main screen safely.
Sometimes it's those little things that can sway you.....they are very happy with their BMW they eventually went with.