Nothing if one wants to put lots of hours on the laser assembly. Only so many hours.
charles
I agree with you on there. that is why in the old days I kept a cheap CD player in the garage that was used only got break-in purposes. It didin't sound all too good at all, but it was good enough to use to put a CD on repeat for several days. And if it wore out or broke, oh well.
Nowadays I have gotten a bit more high tech and use my streamer to provide break in signals. If I just need music I make a Tidal playlist and put it on continuous repeat and if I want to use a break in track from one of those dedicated break in/demag discs I simply copy the tracks I want to use to a flash drive and play that on a continuous loop. Either way I am getting music with no moving parts to break or wear out.