Well, i have one just for practice, installed on a dummy gun i made, just to exercise my "steadiness" on distance.
Cost about 20 dollars and seems to be nice.
But i don't believe that the cheap lines will made a good job for shooting.
Maybe the more "expensive" line of Konus will made a better job, depending on scopes features.
I have tested a 180€ Scope of this brand in the store and was really nice.
Have in mind that the ones i saw and the one i have, where all made in P.R.C and i don't know the standards up there, in comparison with brands like Zeiss or US Optics.