I have a pair (actually 3) of Serengetis and I love them. The first set the sent me had a tiny nick on the edge of the lens and they spent me two extra pairs without me even sending the first set back. They are huge aviators and they are great because the cover my entire field of vision. Also, the lenses fade so that the bottom is lighter than the top. This makes it easier to see the instruments when wearing them. I have had them for 7 years and have never had any problems. My two backups have never had to be used.

If you are the type of person who is careful with shades, then I would get a nice pair. If you always find yourself breaking glasses, then get a cheap pair. Just make sure they cover your entire field of vision. The hip designs may look cool, but I noticed many of them fail to work when the sun is coming in an area where there is no lens.