Good Tom will remember your anniversary. He will remember your birthday, and the birthdays of your friends and family. He will never judge you, he will always listen, and he's just an all around good guy. The only cost of being in a relationship with him is ADVENTURE.
And, y'know, sometimes people that absurdly good can be grating. But mostly adventure.
He can also sense when puppies are in danger. This is apparently canon now.