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There are quite a few dual-action rods out there, the most popular being Stew Mac's "hot rod".
Other single, traditional truss rods can be either straight or curved; which is yours?
If you're thinking of replacing it, a dual-action rod would be sweet if you want the ultimate control over your neck. But on the other hand, it may require more routing. Stew Mac sells a special bit to do that, I bought one myself just so I could fit the rod.
And if you have a curved rod already in the neck, that'd be hard to replace it with any other kind of rod.
Also, the dual-action simply adjusts both ways; when you adjust the nut, they kind of bend one way or another, so you can actually force relief in your neck (rarely needed), and of course induce backbow like any truss. So that's the advantage. It's probably stronger than a single rod too, when using no pressure.
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