Had 2011 Ford Edge for 4 days. While driving approximately 30 mph, the rear half of the 'vista' roof glass exploded/shattered. No other car was near, there wasn't even so much as a bump in the road to cause it. The weather was sunny/warm, but in the 90s so I couldn't just be from heat. Dealer has stated Ford doesn't consider this a warranty item. Had to file insurance claim. Roofs should not explode and shatter without impact.