Pretty good, but...
I like my holder, but it slips off my glasses too easily.  The little springs that slide and hold the loops that grip  the arms of the glasses, slide too easily.  I  seem to have largely &#34;fixed&#34; this by using a pair of pliers or vice-grips to clamp down hard on the loops once I've got the springs tight on the arms of my glasses.  This deforms the springs, maybe damages them, but they hold the glasses tight now.  I probably can't take the holders off now, but that's ok for me.  Otherwise, I love the materials, the proportions, etc..  I there were a way to lock the springs firmly in place on the loops, as opposed to my mashing them in place, that would probably be ideal.
Rating: 4 stars