Guess it depends on what you mean by 'blind.' To me, it either means one of the TENTS that are currently popular, or what has been referred to as a 'natural blind,' i.e. a blow down or the like that is hunted as-is, or perhaps has been modified a bit. Personally, I don't use the tents, but the biggest deer I ever harvested (9 point) was from a natural blind. I've also taken a few from no blind at all.

Small buck at 8 yards - the funny thing is that at the time the longest distance in our apartment was 8 yards so that is the distance I did most of my practicing at. He passed within 5 yards of me on three sides, turned in an unexpected direction and stopped right in front of me - had I let him pass he'd have done a complete circle less a step or two. I had skunk scent out.

Doe at 15 yards.