jaymatt wrote:
"Gotten is a past tense form of the verb to get. ... The past tense form of get is got; the past participle of got is gotten. A past participle is a word that's used with had, have or has. Therefore, it's perfectly acceptable to use gotten if it's being used with its companion word.” --Oxford Dictionary
Hence, “gotten” is a good word in American English. For the British, I hear, not so much.
You colonials make your own rules - and don't pay your taxes.