I was given a couple BSA Sweet 22 6-18x40 scopes several years ago by a friend of mine that owns a gun shop.He wanted me to try them out,and give him a report on how they performed.
Knowing the track record on "Cheap" scopes,I told him not to expect much. I mounted both of them on 10/22T rifles,and did a complete testing of the scopes.
They performed alot better than I'd thought.The clarity isn't great,but clear enough for rimfire work.Parallex was OK,from 15-100yds.Tracking was OK.
The scopes also hold a zero pretty well. Eye relief was good also.
They came with 3 Turret caps that are marked for different weight bullets.Depending on the ammo your shooting,the calibrations are hit or miss.Some ammo shoots faster/slower than the turrets are calibrated.So,I had to test different ammo in order to find just what each was calibrated to.When I found a type of ammo that shot the same fps that the turrets were marked for,they worked pretty good out to 150yds,but it had to be a calm day to shoot that far with any accuracy.
I still have one of them on my 10/22,and it'll probably stay there until I break it.
If you can only afford this type of scope,they do work.But I'll spend a little more money and get a better quality scope.