Low light conditions bring out the low in low quality optics. One hazy morning a couple of years ago, a nice buck stepped into a thicket just as the sun went behind a cloud. I got only a fuzzy glimpse of him through my old 4x pistol scope as he disappeared. Having seen the light, pun intended, I replaced the old scope with a Leupold 2.5 x 28mm Scout scope. Wow, what an improvement!
The far better quality of the image through the Leupold 2.5 x 28mm Scout scope vs the image through the 4x pistol scope prompted me to do a side-by-side comparison of all my scout and pistol scopes. Late one afternoon I turned off my living room lights and one-by-one with all my LER and EER scopes, looked through my front screen door at my mailbox located some 75 yds across my yard. Through a red dot, I could not tell I was looking at a mailbox, only a black lump. Through a few 2x and 4x pistol scopes, I could tell I was looking at a mailbox. However, through the Leupold 2.5 x 28mm Scout scope I could not only tell I was looking at a mailbox, I could read the letters on its side!
Since that day, I replaced one of the low quality scopes with a Burris 2 x 20 pistol scope. Via the same mailbox test, its optics looked just as good as the Leupold's optics. Long story short, high quality optics are worth the extra money.