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Video: How Do The Discs Look?
These are capable 1.78:1 1080i transfers, but by no means are they fully-formed. Archival footage has really been cleaned up so there is a consistent visual quality throughout the show. Colors are more rich and well-defined than they were on earlier-season DVD editions. There are a number of examples of compression artifacting, though - it's not enough to mar the entire feel of the series, but you can't exactly get around them, either.

Audio: How Do The Discs Sound?
This set comes with a set of DTS-HD 2.0 Master Audio sound mixes. And unlike the hit-and-miss sensibility of the show's video counterpart, these tracks are well-balanced and crisp throughout. Dialogue is strong, music comes through nicely - they're not exceptionally adventurous mixes, but they're represented on Blu-ray appropriately, nonetheless.
English subtitles are included.