The reason people say that their binoc's (non Swaro, leica, or Zeiss) is because they can't properly judge glass.

To judge glass, the first test is to map the glass. Pick an object with a lot of detail and focus on it, from there move your glass up/down and left and right. Notice the point where the distortion start, on the cheap glass about up to 40% of the lense will be blurry.

Why does this matter? Imagine hunting with no peripheral vision, when you use cheap bino's you loose it. Also the distortion causes headaches and eye fatigue over time.. Look though a pair of nikons or vortex's all day and you will have a headache and eye strain.

Next look at the color, good color distinction allows you to pick the brown of a mule deer out of a dirt patch of sage, or an ear tip out in a clear cut.

Also scan with the binos and you'll notice distortion when you do that as well.

Most of them look good in the center but fail in the details.