Promotional copy - any different in sound quality?

I have a large collection of White Label Promos (WLP)that I have purchased over the years. My view on the sound quality of these promos has changed with the passage of time.

Up until recently I felt the WLP were superior sonically but as my system got better and my record cleaning techniques improved, I use the Walker Prelude record cleaning system, careful listening comparisons with many original pressings of the same record indicate that the WLP do sound on average a little better than the average vinyl pressing but if you acquire 4-6 regular copies of that same record the Promo copy rarely wins in the shoot-out. I no longer look for promos of any kind anymore but instead just look for clean originals and evaluate each copy separately.

Johnny

I still love to play my 6 eye columbia Miles Davis Kind of Blue. Its only better because its the first press of a great classic and still plays wonderfully.

I HAVE A FEW PROMOTIONAL COPIES OF RECORDS, ALL ARE 45 RPM'S. MOST SOUND JUST LIKE THE THE FINAL RELEASE BUT SOME DON'T. I ALLWAYS FELT THAT THESE ARE WORTH HAVING IN A RECORD COLLECTION BECAUSE THERE ARE FEW OF THESE IN EXISTANCE. SOME OF MY PROMO'S CAME FROM RADIO STATIONS AND EVEN HAVE THE STATION CALL LETTERS OR OTHER INFO WRITTEN ON THEM. PROMOTIONAL RECORDS ALWAYS GET MY ATTENTION AND I GRAB THEM WHENEVER I CAN.