The original saddle was ceramic and wide. Although the plastic bridge is hollow, all of the hardware weighed 2.75 oz. So getting rid of that was good. The tone before was great, but the guitar would not intonate. Even if the plastic looks like it's in good shape, the slightest warping throws off the intonation. And after 50 years of 6 strings pulling, it can't stay straight. It also had a bit of "sitaring" on some strings. Has a good old James Taylor tone.
I expected to be thrown off by the new sound, and kind of was at first. But when I sat down, played it and got a feel for it, I noticed it had even more mojo. Seemed to be much happier with it's new duds. The tone was even, deep and resonant. And it's in tune up the neck.
The problem with the plastic bridge is you always ask yourself how much better it would sound with a rosewood one that is actually glued to the guitar. The answer is much better. As longs as you do it to exact Gibson specs, it's all good. If you want to play the guitar, change to the rosewood bridge.