I have been using xscent base layers for the past 2 years and swear by them. I predominately hunt on the ground in natural brush blinds. I have had elk down wind of me within 3 feet, deer within a foot and much more game within 3 yards. The time I sat in a treestand I had one doe sniffing the foot pegs of the tree I was sitting in. Does that count as zero yards?
I use a combination of xscent baselayers and poly pro mid layers in early season with a mosquito net leafy camo suit over top. The total price was like $100 bucks for complete camo suit and scent protection.
As the weather gets cold I use the same base layer and mid layer just team it up with ULTRA silent cabelas coat and pants.
Here is an article about carbon activation:
http://www.outdoorscentral.com/artma...icle_169.shtml
I personally wouldn't waste the money. I think those people who do swear by carbon are far more cautious about scent and take the extra precautions that let them get into those close encounter situations. Scent killing is an art in its own.
Camo is only used to break up your outline. It is also not effective when you are moving. I personally use Mossy Oak New Breakup, just because it was the cheapest and the colours blend well enough in Alberta. In my opinion the best camo you can get is CADPAT, the digital military camo. When the snow flies, I have my whites, I just havent had to use them yet!
Rene