I had one with the .25 adjustments.
The glass on mine was quite clear all the way up to 16, actually, I was pleasantly surprised. The adjustments were repeatable, but once you started cranking the thing up, when you began to reach the end of the adjustment range, the elevation knob was all cockeyed.
I gave it to my son, it is still working just fine, for 300 bones, it is a pretty good deal.
HOWEVER, for 300 bones, the midwayusa exclusive weaver tactical 3-10x is a MUCH better scope.
No, it doesn't have illumination and the magnification isn't nearly as high, but it is leaps and bounds above the millet in quality (made Japan vs China).