Going strictly by ones that I've actually owned, here's a few of each:
Best- Nightforce, Weaver, Burris
Worst- Barska, BSA, anything that I've bought on a package gun, and Barska. Did I mention Barska??
Middle - Leupold (vx1's), Swift, Millett, lower-end Bushnells, Tasco, Simmons
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