I have adopted. He's grown up now. I've never regretted it for one minute - ever. I have always felt especially privileged to be able to be the mother of son that someone else delivered. I have to biological children as well. How I feel about being my eldest son's mother and their mother is the same. I was aware, with my son, that I need to think out how to present some truths to him, so that was one thing I had with him but not his siblings.
Just as people usually feel like having children makes them feel like they're "more of a person" than before they had children (in terms of emotional growth, strength, and maturity), I feel that way with my eldest son - only I feel that that having adopted a child also made me yet "more of a person" in a slightly different way, as well.
Whenever I'm thinking about how I feel about any of my children, I realize my heart is kind of pounding ever so slightly. I feel that way when I think about how I feel about having adopted my eldest son, or how I feel about him now that he's grown, as well.