I installed these saddles on an LTD GL-256 super strat with vintage tremolo.
The build quality is excellent, and they avoid string breakage indeed.
The overall sustain of the instrument increased also sensibly, and the tuning stability improved noticeably.
However, even though they added plenty of lower harmonics, after the installation the guitar sounded way darker. Not muddier, but the lower harmonics became too dominant.
Therefore I would definitely recommend this product if you have a too bright, thin or even piercing sounding guitar. It will definitely make the sound fatter and richer.