The trick to hunting out of these ground blinds is to keep as many windows CLOSED as you can especially the ones behind you. Only open the windows that you need to in order to make the shot, similar to clearing sooting lanes for your treestand. Also, if it is black lined on the inside like most are, wear black clothing especially on your hands and face and sit as far back from the windows as possible. And as others have said, sit in one corner and shoot out of the opposite corner, it will give you quite a bit of extra room to draw and shoot.

And yes if you can afford it, get a Double Bull Matrix. I have 3 blinds (1) DB T5 , (1) Ameristep Brickhouse (junk IMO but cheap) and (1) DB Matrix. The Matrix is by far my favorite.