I've got a couple of them. I like them. I'm no expert on glass but I think their decent.
I like the fine cross hairs, the adjustable objective and the 1/8 minute adjustments. I like to use them when I'm shooting at 200 yards for certain load developments. I have the older models about 6 to 8 years old. Don't know about the newer models. Haven't used them in a while but I remember they seem to track well. I think for the money their not bad.