I bought these to carry with us in our travel trailer because they were inexpensive and from a manufacturer with a name I knew.  My wife and I love them!  They were easy to set up and the instructions clearly tell how to use the diopter to get perfect vision, even though I wear prescription glasses and one eye is slightly weaker than the other.  We especially like the quick focus feature where you use a simple toggle lever adjustment in lieue of a dial in the center or the binoculars to focus the scene.  They have a nice carrying case to protect them from scratches too.