Started to post this in the other ground blind thread, but decided to make one of my own..:p I have been hunting out of ground blinds for over 25 years and have never shot through the mesh. I know you can with fixed blades with no issues.. I always leave window open in the direction I expect to shoot always wear dark clothing and sit as far back in the blind as I can.. I have had deer walk within 5 yds and never even knew I was in the world.. Now lets talk about brushing in a blind....nope have never done it except for maybe a cedar branch on top and a limb or two leaning against it some times. I will back up against a big pine or cedar with some low hanging branches I don't get to carried away.. I have popped up a ground blind mid-day and 3 hours later had deer walk by and nary give it a glance. That is not to say brushing is not valuable I am just saying in my area I have never had any issues.. I think the shape of the blind is in my experience very important deer seem to get used to round top ground blinds much faster then a flat top, the round shape is a much more natural shape in nature I believe.. If I was going to design a ground blind I would lower the bottom of the window about 3" and lower the top of the window about 4", one of the biggest issues with folks new to ground blind hunting is shooting bottom edge of window especially if you are not a tall person.. I am 5'8" and yes I have done this twice, thankfully both times on doe's. I currently have 4 ground blinds set up on 3 food plots all have been out since august and two have been move a few times the deer don't seem to care.. What works for me may not work for you these are just a few observations by me on my 108ac property where we try and keep the pressure and impact at a minimum only two of us hunt it , my wife and I and mostly only on the weekends.