A couple years ago I sent a Leupold back for service and needed a scope in a pinch for a p-dog trip I was going on, so I bought a $90 Barska 6-24x50mm "varmint" scope.
For $100, you aren't expecting much, and you're not getting much. A Bushnell Banner is a better scope by far, but it's also more than $100.
The Barska does not track well, fogs terribly, and has incredibly poor resolution. Light transmission is poor, and tuning the parallax (adjustable eyepiece and objective) is laborsome for different ranges. The click adjustments are irregular, sometimes a click has a lot of resistance and makes a confident "CLICK", other clicks are soft/mushy, and don't offer a positive snap into position (part of the poor tracking).
I now use this scope for shooting test groups in rifles I build for sale (AR's). It works for what limited use I have for it and it IS kind of nice having a scope I don't care about to mount and un-mount over and over again, but man, I do regret spending $90 on it.