For me, this set was crazy expensive. I've been pondering this purchase for months. But in the end it was totally worth it. Adjusting the nut grooves for ideal height makes guitar play and feel so much better. You may need to cut just 0.2mm extra, but it does wonders to guitar playability. For cheap guitars it's the best upgrade you can do. For medium grade guitars, the difference is still huge.
More specifically:
- Fretting at low frets takes much less effort (e.g. for Fm or Bb chords).
- Intonation at low frets is more accurate (notes don't sound sharp because you have to press hard).
- Overall string action is lower without adding fret buzz.
- As a result of lower action, the guitar plays lighter everywhere across the fretboard.
Of course, its also easy to mess it up and cut nut grooves to deep. Be extra careful, proceed slowly and check often!