Steelbook is the case on the far left. They're metal game cases, and are usually quite nice. The chances are probably diddly that the container on the right is wood because, well, that would be too nice.
In any case, there are only 3 things that would make me buy a collectors edition these days. It has to have either a artbook, steelbook case, or a soundtrack. At least this has one of them. Figures are usually junk, so I try to avoid them. The fact that it's Sideshow speaks a little more to me though.