I've got a couple of necks that have been curing for a long time and I'm thinking about getting back to work on them. I've heard a lot about these carbon fiber rods, and they sound like they might be a good thing. But I'm wondering how "necessary" they are. I can see how they would help with stability, but I'm wondering what they would do for (or to) the tone. Has anybody had a chance to compare this? The necks are 5 piece laminates. Maple and Koa with a 1/8" purple heart strip in the center.