The things that make an action "Precision", mainly insuring that all criticle fits are true and square, are no better, or worse, than a cheap ADL.
I have true quite a few, and the only diffence I eve saw was the lack of a magazine cut away.
This is an old argument. It's amazing there are still those who do not know this.
That being said, a complete and Factory original 40x does command a premium price, much like unmolested vintage muscle cars. There seems to be a sort of cult status surrounding them.
If you have one, don't put it in a custom stock, change the trigger, or the barrel, or anything else that would take away from it's originality. It has much more value "bone stock".