Do all CD players benefit from burn in?

Like Buconero117, for the longest time I thought component burn-in was a load B.S . It just sounded like a load of crap and that it was really just a period of time for the listener to adjustment to the new sound .I now know differently.

Edgy and bright will still be edgy and bright after 200 hrs. The listener adjustment wont overcome that.
Burn in will.

Having just finished my system (added cables) I wondered this. I use my wife as a guinea pig as she has better hearing and no idea what stuff costs. We both have found that any a/b comparisons suffer greatly after a few days (maybe less) and we are unable to tell any difference. Mind this is differences in specific samples we selected to test. I'm gonna stay out of this fight but I'm curious if folks do anything different for long term comparos than they would short?

Short answer is yes, I just reached about 500hrs on an Oppo 95 and witnessed it first hand!

During and after burn in, I find it helpful to leave the players power switch on.