It made sense to make Kaya a shipyard heiress, and having Usopp work there. I liked the emphasis on Luffy "picking" the Merry and him saying it would be like one of the crew.
Jacob as Usopp is great, and Kaya felt more like an actual character here than she ever did in the manga.
Child Usopp unfortunately was a little eh, and the scene where his mom dies felt even more rushed than in the manga, did very little for me (again a pacing thing, I think that scene hit in the manga because of how it's placed right at the end).
Sham and Buchi... eh, they're in bottom tier of characters in the manga, and they're pretty uninteresting here as well. Didn't care for them much, but I guess they're better in comparison.
Kuro's plan being less convoluted is of course a good thing, was always one of my main criticisms of the arc.
Zoro getting stuck in a well instead of on an oily slope is sooooo much better. Also the first flashback to feel perfectly placed, and paced. Very effective way to reveal what drives Zoro.
Also... "hey, haircut", maaaan Zoro and Helmeppo's dynamic is hilarious.
Klahadore/Kuro was a bit much for a while with the scraping against the walls and the almost parodical "menacing" voice (Kaaaayaaaa... Kaaaayaaaaa.... come out come out wherever you are type beat). But other than those sequences he was fine as well, and once he actually got mad, he was menacing for real.
BTW... WE ARE!? As they sail on the Merry the first time!? I got goosebumps.
I think these episodes were ingenious for selling new people and Syrup Village-haters on the arc. And it's a cool way to show the versatility of this story, how it can go from pure adventure to pure thriller in the space of an episode.
Also, I'm in the camp that's not mad at Merry staying dead. Not because he's even nearly a fake-out I was ever the most upset about, but because it gives us hope those worse fake-outs will be redeemed as well.