I have always used MacPros...great laptops.  However, Apple issued a recall on the keyboards of this model and several others through 2019.  Apple would replace the keyboard free - usually a $500 cost.  However, this laptop never had the keyboard changed out.  I think anyone refurbishing a Mac should know to check for any recall and fix it.  The free change out on this model ended December 2021.  So from the very first time I typed on the keyboard it was typing double letters over and over......