I go carry-on only after having one bag destroyed, a couple lost for several hours, and had things stolen out of my bag twice. I'm getting closer to my goal of being able to pack everything for a week or longer in a bag that United would call personal-sized so I don't have to worry about bin space - it also helps I'm petite. I can readily pack for stricter airline weight requirements (LX and VS have weighed my bags). The advantages I see are not having to wait, especially after international flights, having everything under my control, and ease of using public transportation, especially when one just has a small backpack.