I put this on one of my acoustic projects, it works great even for guitars that dont have a slotted nut fitting!
It may require some customization of the guitar so beware if you are not comfortable with this, depending on how far you need to lower the screws for each individual string it may interfere with the neckjoint.
I simply drilled tiny holes for the screws to be able to submerge further.
I was a bit worried that the strings would slip or even "turn" the screws since i fitted this onto a 3+3 without string guiders, but i had no such problem!
This product is great if you find yourself trying different string gauges or simply trying to set up a guitar and dont like filing nut slots!