Difference between Superman Ultimate releases?
 

Online retailers list 2 releases for the 14-disc silver-boxed Superman Ultimate Collection set (2006 & 2007). Does anyone know the difference?

the original batch (2006) had two defective discs (superman: the movie and superman iii) that you have to send in to get the correct discs.

the second batch (2007) has a new SKU and contains the corrected discs already in-pack with no need to send away for new ones.