I use natural ground blinds all the time. I know this saturday I my plan is to sit in a brush blind that I have had a bunch of bucks feeding by it. I have had same day success with the ground blinds if I use a quick "ground nest" with good back ground or just set up in cover that is already there,deadfall,thick stands of trees,ect... I don't like to make big brush blinds if I plan on same day hunts,most I still try to build blinds in advanced. I have seen plenty of big old mulies/elk that will advoid anything that is new in the area. Most of the time I do as Jerry did in the pic above.