I didn't change mine. My DD has my surname as I had her as a single mum before I married DH, I don't have children with DH so having the same name as my children has never been an issue.
My parents come from a country where women retain their surnames on marriage so it's not been seen as a big deal to keep my name (although DH and I have always lived in the UK).
I might consider using DH's surname in future for work purposes, if I end up working in a field that requires me to be searchable online - that is mainly for personal security so that I couldn't be Googled by certain people from my past. I suppose I could use any random surname for that though, although I like the fact that women are able to switch between married/maiden names for work/personal reasons.