Superbit is a subsidiary of Columbia TriStar Home Entertainment which makes DVD's that have absolutely no special features.

They claim that the extra space where special features would go instead goes to having a higher bitrate, and therefore higher quality.
I have one of their DVD's (Gattaca). I can say that their propaganda has no basis in reality. The quality is the same to my eye. The only redeeming factor about Superbit DVD's is that they have 2 audio streams (DTS and Dolby), and 5 subtitle languages, so if I want to watch the movie with korean subtitles (keep in mind this is a region 1 DVD) I can.
Here's a current list of the DVD's they offer: