Own a Ghost Blind, use it occasionally. It's pretty nice for run and gun hunting. I take the bag off my pack frame and strap the blind to the pack with a chair. Not too heavy, but holy eff will it toss you around in a stiff breeze. Like having a big sail strapped to your back.
As for efficacy, I've been within 10 yards of plenty of deer and turkeys without getting busted. But that's remaining ABSOLUTELY still. I bought the extenders for all 4 panels, which helps a lot for drawing a bow.
But here's my bottom line review: Awesome concealment. Lighter on the back than a Double Bull. Works scary well in standing corn. Sucks in the wind. Can't leave it out for the season like a hub blind (it's constructed of corrugated plastic).