Heretic, the Superbit disc is not another format, it's merely a higher resolution pressing, which means a higher number of binary digits (bits) are used to convey the same information, which results in a picture (and sound, supposedly) that is sharper.
Is it an obvious difference, will it show with your equipment, and is it worth the cost? The best way to answer this, besides reading posts from others and magazine articles, is to evaluate it for yourself.
Larry
www.fineelectricco.com