My Bestop Cable Safari Bikini just arrived yesterday so I don't have real world experience yet. However before I arrived at my decision I spoke with 3 Jeep friends and they all said the Windjammers were must have for highway driving. I figured I'd start with the Safari top and then add the Windjammer and/or Duster cover later. They said the Windammer won't keep all the wind/rain/dust out but they do cut down on it considerably.
2011 JKU Sahara; Sahara Tan, Leather, 3.73, Auto, Hard/Soft Top, SpiderWebShade, Dead Pedal, Skid Row Foot Pegs, BFG KO2, 10a Wheels