I purchased these sunglasses because - unfortunately - I lost a pair of Mosley Tribes (now Oliver Peoples West) a few weeks ago.  This was my first pair of Persol's.  After trying a few different pairs on at the store, I decided to purchase these online.  After less than a week of wearing them, I've decided to return them.<br /><br />The quality of these sunglasses are great.  They feel very well built and sturdy.  However, the lenses are extremely HEAVY, thus they constantly would slide off of my nose.  I could be sitting completely still in the car, and they would start sliding down.  Obviously, this was annoying, as I was constantly having to adjust them.<br /><br />I also found that the lenses would become smudged very easily.  I don't do anything particularly arduous wearing my sunglasses, but I was constantly having to wipe them off.<br /><br />The other minor issue I had with them was that they are very wide.  I have a pretty large head, yet the arms barely hugged my head.  When I would put these sunglasses on top of my head, they would fall off / down with minor movement.<br /><br />I was satisfied with the quality - in some ways - of these sunglasses, and I'm sure they would work for some people.  But, for the amount of money spent on these, and Persol's reputation, I was disappointed.