I've done the assessment for both work and personal reasons a few times over the years.
I've always been an ISTP. However, the "I" had become less extreme as I've gotten older (according to the assessments).
People who know me IRL superficially are always surprised. My close friends aren't. I've learned to fake the "I" quite well over time when in the wild places of Man. But I've bookmarked this note so that I can take it over the weekend. It's been a long while since I've done it.