Personally, the Lightspeed Zulu is my favorite.  It's light weight and soooo comfortable.  I have not tried out the Zulu.2 yet, but hear it's great.  To those that posted that it's hard to find more information about headsets... you can always contact the brands themselves.  They should be able to give you more information than the websites (although sometimes they just quote their own websites).  If you really want more in depth information, call you local pilot shop.  I know that there aren't many actual brick and mortar shops left, but the staff there usually know more about the products they are selling than most and can give you a good idea of the reviews and "chatter" they have heard or experienced with certain brands or companies.  Hopefully this helps!   Oh, and...   EAA and Wings of Hope is raffling off Roy Clark's airplane AND a private pilot scholarship AND a new Lightspeed Zulu headset... raffle tickets are only $50!  Check it out here: http://www.wingsofhoperaffle.org/