The bridge on my secondhand Gibson ES 135 was corroded, the notches were worn out and most of the screws to adjust the intonation had become useless. Replacing the bridge took about half a minute as the dimensions were exactly the same, and now my guitar is reborn. I'm not sure whether the 'rollers' affect the sound, but they probably won't wear out and the strings don't get stuck. Very glad I could buy this bridge for a reasonable price.