This set of 4 discs gives the run of Season 4 episodes
104 -- "Luffy vs. Vivi! The Tearful Vow to ..." to
130 -- "Scent of Danger! The Seventh Member is ..."
This ends the Baroque Works / Alabasta storyline started back in episode 65. One story arc, 66 episodes. That's a record for me. Also, episodes 110 to 126 span the course of a half an hour.
Still, I liked it. I preferred the amount of ground covered in episodes 1-64 with many story arcs over the single story arc in episodes 65-130. Most of the episodes are very character-centric, with all of them getting at least two or three episodes to themselves. Each in the series of long fights is inventive and clever, with great dialog throughout. For example, for episode 117, a flashback reveals that Nami asked Usop for some sort of great weapon that could help her to hold up as a fighter with the rest of the crew. Usop gives her a staff that will also be fun at parties. Out of the flashback, Nami has the staff, and she's desperately trying to read the instructions while a spike-powered assassin tries to kill her. She keeps getting the party tricks the staff can do.
I liked at least one thing in every episode, and often more than that. I'll stay with the series. Collection Six looks like it will have some shorter, self-contained arcs, which will be a relief after the Alabasta monster.
If you liked collections One-Three, then you'll like the collection Four-Five arc. Recommended.