Have you ever flown first class on a plane flight?

Flown First Class twice in my life. First time was on military standby when I was a buck private, and the First Class section was mostly made up of off-duty stewardesses -- they were still stewardesses back then -- en route to their next assignments. Champagne was flowing. Second time when Alitalia and their American partner airline screwed up our reservations flying back from Sicily, so they upgraded us to the only available seats, which were First Class. Definitely more comfortable but not sure it is worth the price difference.