Mine were an anniversary gift from a company I used to work for, so I didn't buy them.  I have had them about nine years.  When I first got them they functioned well and had great clarity/magnification which was all well and good, but note that the lens caps will NOT stay on and the so-called strap they come with is absolutely worthless.  After about five years the focusing mechanism stopped working altogether while sitting on the shelf (I got them out to use them, and it simply would not work any longer).