As mentioned above, it can't hurt. I haven't used it, simply because I don't want to become dependant on it. They work, but they must be either replaced with fresh ones or dehydrated periodically. Otherwise they'll stop being effective after they absorb their limit of moisture. Might not realize it's lost it's effectiveness until damage has occurred. I've had good luck by making sure the knives are clean and free of dirt, moisture, salts & acids, before putting them away. Wiping them down with Windex or isoproply alcohol works very well for this. And then, I'll seal them in clean, new zip-loc bags. I have some knives that've been stored this way for 15-20 years, and they're in fine shape. Carbon blades will still patina a bit, from exposure to oxygen, but that's OK.
Some like to oil their blades before putting them away. Just make sure they're absolutely clean & dry before doing so, or the oil can trap all that rust-causing stuff against the blade. Use a clean rag or paper towel to oil them, for the same reasons.
Avoid storing knives in or with leather sheaths. Acidic chemicals in the tanning agent for the leather can react with and corrode steel (and brass & nickel, too).