I've been looking around for alternatives and there really are not that many that are purely bus powered, and those that are are usually more expensive than Apple's, larger, heavier and don't look as nice. The only disadvantage of the Apple unit is that it can't be used in a hub, but when I started thinking about how I'll use it in practice (not very often for movies and sometimes for installations), I realized that I can live with that restriction even if I don't really like it. It's a nice drive and actually very affordable too. Should have been included in the box and I suspect that is coming in the future.