What made this film so interesting to me was that it explores themes, dreams and values that I can really relate to at this point, such as traveling and isolation. In terms of analyzing this lifestyle, the movie raises more questions than it gives answers. In the end, it's up to the viewer to decide which philosophy makes the most sense, which is pretty cool.
Then you've got the acting, which is phenomenal across the board, and the writing, which is witty and seems to have a perfect understanding of its characters, and people in general. Cinematography-wise, it's generally pretty subtle, but it works well.
In a sentence:
A fascinating look and analysis of the frequent flyer and isolated businessman, along with a few other lifestyles, all wrapped in great writing, acting and cinematography.