BWM,

If you have a guitar Plekked, a new nut is the way to go. The machine cuts the nut slots. It's incredibly accurate at 1400th's of a millimetre.

Is it worth the expense? That depends on you but to me it is. I've had setups with Plek and without, and I've always found Plek better.

Bear in mind, though, that a Plek machine is only as good as the operator.

-F