I've used several pairs and not had any problems with them. RTZ when removing and reinstalling scope has been pretty decent too. They're not as refined as many offerings, but seem to do what they're intended to do just fine.

John

If my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then I will hear from heaven, and I will forgive their sin and will heal their land. 2 Chronicles 7:14