I have installed this brass nut on two Stratocasters and one Telecaster. It makes adjusting the string action very easy, because the height can now be easily adjusted up and down both at the nut and at the bridge. In combination with the truss rod it is possible to set an extremely low action, without the risk of filing the string slots too low, because with this adjustable nut, if you screw it down too low, just lift the buzzing string off the screw, unscrew it a quarter turn or two, drop the string back and voila, the buzzing disappears. The installation takes some time though, there is a lot of paring and filing of the nut slot in the neck to get a perfect fit, and of course the drilling of six small holes mentioned by other reviewers. Nothing really difficult, but it takes time if you want to do it well. The nut itself needs some work too, it is bulky and has sharp edges. File the edges and corners down a bit and round it with fine sand paper, then polish it using chrome polish and it will shine and feel comfortable to the hand. The tone and sustain is really fine, i hear no difference to a bone nut. A perfectly adjusted guitar is fun and inspiring to play, the feel is as important as the sound. I also installed a similar (same brand, other model) brass nut on an acoustic, where it was a drop in replacement for the original nut, with no filing or paring. I will buy this product again.
