This nut seems to be of high quality. I've read many, many reviews, and it always seems to be the top choice, apparently there is more tonal consistency than my favored bone nuts . The 'XL' version is claimed to be permanently lubricated, useful for vibrato equipped guitars. There are no obvious defect in manufacturing, it looks very precisely made. That it can fit both flat and arched nut slots means I don't have to pull the old nut before ordering.
I have not yet installed this nut, I purchased it as a spare part to keep around for when I need it rather than having to wait for a new nut to arrive. Looking at this one, I will now order Tusq nuts for all of my guitars just to have them on hand when they're needed.