Love the fact that they are dark enough for those especially sunny days. Great field of view.
The only problem i have with these it that its hard to wear them with a hat. A bit awkward. On some occasions they start to give me headaches and I need to take them off for a few minutes.
And one last thing, they don't stay on your head if you push them up when going indoors. They slide off all the time so I have to put them in a pocket and risk smashing into something and maybe breaking them, or leave them in the car.