A real ghillie is heavy! I am too lazy to wear one even if I thought it would help. Instead I have a ASAT 3-D suit and I love it.
http://www.asatcamo.com/home1.htm
I shot a young buck with my bow this year from 6 yards away. I was on the ground, in the middle of the 4 wheeler trail and the deer walked right up to me. He was looking right at me and could not see that I was there. My buddy wears the same thing and had a doe come up and sniff him. We have also had turkeys walk up on us while we were sitting in the middle of the road with no cover.