I just needed some cheap sun glasses for a marathon... over 6 months ago.  And still to this day I find myself reaching for these over my expensive sunglasses.  They are now my go to glasses for everything.... Running, biking, driving, etc.  I will continue to buy these until they stop making them.

Update: 11 months after buying theses, I purchaced another pair for an ultramarathon in SC and they're still awesome, could hardly tell they were own.