Everyone should buy the sunglasses that make them happy. But the truth is, for a cyclist, sunglasses are like helmets. Beyond the basic models that give you protection (impact for helmets; UV, glare, and air-borne particles for sunglasses), you're pretty much paying for style, comfort, durability, and other "coolness" factors, typically with diminishing returns.

Buy the price point that appeals to you, but don't mock those who choose other solutions. And don't laugh at people with fogged lenses... be a mensch and hand them a tissue.

Peace out.