Not a GUC, but maybe a poor-man's GUC, my status gave me access to 10J on Air France flight AF10 A380 service CDG to JFK (seat selection via AF twitter, I think...). 10K didn't show up, so me and a whole lot of space made the trip across the Atlantic. It really was great; the lav in front of the seat was almost unused, the galley beside the seat was quiet after the lunch service. If only the seats had electrical power and wifi... Of course one is envious of 'La premiere' on the other side of the curtain...