I certainly love my Serengetis but I have found that for the GA environment Shields are a great solution. They have an elastic strap not arms so that my Dave Clark noise cancelling headphones are comfortable for over 5 hours. The lenses provide 180 degrees of distortion free vision and they do a huge range of lenses including prescription.
I have just seen on
www.shieldseyewear.com that they have downgraded their lifetime accidental damage guarantee to two years, but is still good.
But the best feature is the float on the back of the cord. So in the event of my ditching my aircraft in the North Sea at least I will still have my sunglasses.
They claim to be the only polycorbonate lens that is Optical Class 1. Don't be put off by the $50-80 price tag.