Beefcake needed some time to settle in, but once he got used to his new home he has become a valued member of the family.
When we first brought him home, Beefcake instantly assumed dominance over our older cat, Atlas. Of course, this made Atlas uncomfortable and resulted in some tension between the two, including swatting, hissing, and aggression.
We put a separate food dish in our bedroom for Atlas, and waited. Within about a month, they started wandering into each other's territory, eating out of each other's food dishes, and laying next to each other. Beefcake needed some patience and time. We had considered bringing him back, but waiting turned out to be the right decision.
Today they coexist beautifully together and even groom each other regularly. My lady and I are glad we did not bring Beefcake back simply because he wasn't used to his new home!