Was interesting watching. As usual the presentation bungled anything technical. E.g. they compared the glide from 28,000 feet to a jetliner, saying the jet would reach the ground after 20 minutes and the Solar Impulse after some hours. No word about the glide range, given that the jetliner would fly at 10x the speed... Anyway, yes, it required a huge team, and certainly burnt a lot more than "a drop of fuel". Their agonizing decisions about risk-taking are something for us glider pilots to ponder. Finally, in the last leg, at night over the Arabian desert, the pilot was working hard to make best use of the updrafts and trying to stay out of the downdrafts (at night!) - soaring after all, regardless of the solar aspect :-)