I use these regularly, I hunt trails in the thickest nasty stuff i can find ( i hunt public land) , I find a trail and set up about 10 ft off the trail and i have had them walk right by me. I don't have a clue if the suit helps but I've never been busted by one. But i will say they are more comfortable walking around in this stuff... But i know the suit helps.

Heavenly father, to you I pray,
A majestic deer may come my way.
Let my aim be straight and true,
this my Lord, I pray to you.