There are quite a few brands of hunting clothing that do not use carbon or any other type of odor reducing material in their products and they can cost the same if not more than Scent Lok. Most high quality camo is gonna cost you.
I bought the Scent Lok this year and I have not had a deer bust me yet. I have had them under the ladder of my stand sniffin right where I walked and they hung around for quite some time, and even had several bucks downwind of me that didnt bust me.
Im not saying that its ALL do to the fact of the carbon clothing, but hey I believe it helps. As stated before, If you like it buy it, if not dont worry about it. Its not your money they are spending so go on about your own business.
I like Scent lok, and I wont hesitate to purchase from the company again.