Originally Posted by BIG ND SWEATY
any specific advantages to it?
It has two balls on both sides of each string that act as ball bearings basically that let the string roll freely. It is supposed to prevent all binding in the nut. Another advantage I guess would be that you don't have to file each slot, you just screw it on and have a play. A disadvantage I guess there is probably a limit on how big of strings you can use. I prefer 9-42s so it won't be an issue for me.