It's not the best out there, but it's definitely in the top ten percent
x One Piece
. I haven't seen many crossovers in those categories that are better... or many One Piece
crossovers that are that good at all.
It starts of similar to both manga: idealistic almost to a fault, amusing and even a little heartwarming at times. Then it takes a turn for the darker side as Akatsuki and Sasuke show up.
So give it a whirl. It'll be better than most things you'll find just browsing.