I changed out a set in a 540c 9XL using the ceramics from offshore electrics. The motor was bought used and when received, brgs felt gritty. The end with the removeable bell was easy to change, but the other end, the drive end was not, it was a pia. I never ran it with orig brgs, but it turns smoothly now and seems to run fine.

Time will tell if it makes motor last longer. Bottom line - I needed to replace brgs anyway, didn't want to replace with stock ones.