I got it to replace the original hard plastic nut in a Yamaha Pacifica 112V. It worked perfectly. In fact, even though I expected having to use sandpaper to adjust its dimensions, I didn't have to. After measuring, and removing the leftover glue from the old nut, this one fit perfectly without needing any adjustment (consider that it might not always be the case, but it's very easy to adjust it with some sandpaper).
Tone, especially attack and sustain improved, although as expected it's more noticeable on open strings. Tuning is more stable, probably because of less friction. Do not expect miracles, but definitely worth the 15€ and 15 minutes of work to replace it.