Ponder this question. Did you refer to the brand as "Yves St. Laurent" or "YSL?"
For those who used the former, the change to "Saint Laurent" gives it a more modern vibe (much like when DIOR evolved from Christian Dior). For those who referenced YSL, then the change to SL or SLP is awful! That "Y" was really distinctive in the logo. For example, what are they going to do with the Belle du Jour line?
So while I'm OK with "Saint Laurent," I really dislike SL or SLP. Perhaps that's part of the complete rebranding...no more initials?