As an avid big game hunter with extensive experience using scent containment products, I feel the truth, as usual, is somewhere in the middle. When used properly, I feel that scent elimination clothing and other products are a valuable tool, particularly for the bow hunter. They will not make you scent free but are an effective tool in helping reduce in the amount of scent we release into the air. Getting high above the ground, not smoking, chewing or allowing ourselves to break a sweat are other ways we can help contain our scent. Touching as little as possible on the way into a stand also helps.
Many people expect too much from carbon clothing and don’t understand its limitations. The amount of scent a garment can absorb is limited so it is very important to protect clothing from everyday odors such as getting into the cab of your truck, refueling or from breakfast. Storing them in plastic bags and putting them on in the field and taking them off before leaving will help. Recharging often is another way to insure the clothing is as effective as possible. Keeping your body as clean as possible is another way to cut down on scent; hair is notorious for holding scent.
There is no way to be entirely “scent free” and you should always hunt the wind.