Yes, I have. My (now ex-)husband of 15 years who I’m still good friends with. I wrote a manifestation list with 72 attributes I wanted my SO to have, and he ended up matching 70 of them.
I don’t have time to get into detail about the list and how exactly to do this. You need to be careful what you wish for, though, so make the list as detailed as possible.
Before I manifested my husband, I made some mistakes that backfired. For example, one time I had just come out of a relatively one-sided crush, and the guy had frustrated me to no end by never allowing any closeness. He was a complete gentleman but would never talk about personal things.
So I wrote a soulmate list saying that I wanted someone who “can talk about himself and share his deepest emotions.”
The result was that I got together with a hypersensitive poet who did nothing else but talk about himself and his oh-so-tender and easily hurt feelings. After three weeks, I kicked him to the curb because I couldn’t take his constant whining and his pity parties anymore.
The next time, I wrote that I wanted “someone who can talk about his feelings but is strong and masculine at the same time, and knows when to shut up.”
So yeah, being specific helps.