An old, old post I saw while brosing the current “classics” selection.
Thought I would point out that Bill Bryson covers this in “Mother Tongue”, where he points out that while some people dislike “gotten”, they still use “forgotten”. The distinction between “forgot” and “forgotten” is the same as that between “got” and “gotten”.
“I’ve got a nice car” - I have a car, which I have had for some undetermined but significant period
“I’ve gotten myself a nice car” - I have acquired a car at a very recent point in the past.