“You are my favorite thing, Peter. My very favorite thing.” — Walter Bishop

The title tells you exactly what the technical quality and contents are:

The second season expands on the show's mythology, introducing new characters and deepening the mysteries surrounding the Fringe. The team's encounters with a shapeshifter and the introduction of the Observer Initiative significantly impact the story, raising the stakes and broadening the show's scope.

Because these files are high-bitrate Blu-ray rips, they require specific software to play smoothly:

The complete series reveals that Fringe is perhaps the most tightly plotted serialized show of its era. A case in season 1, episode 4 ("The Arrival") introduces a seemingly random beacon. You will not understand what that beacon is until season 5, episode 11 ("The Boy Must Live").