I was going to change my name legally after I got a job, but now I really like being Ms. Maidenname when dealing with legal/financial/professional things.
I like being Mrs. Husband when we're entertaining guests or going out together, but when discussing things like my work experience or my own financial resources, it makes me feel better to have that historical connection. Maybe it's because I got married late in life (39), have been working since my late teens, have had my own bank account since I was a child and have supported myself since my early 20's. And now that I'm temporarily not working, I'm living off of my money and my family's money; I'm not depending on my husband at all, so financially speaking only, I feel more like my surname should be my father's.
This is just how I feel personally. I still may change it after all. I don't know.