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Depends, since they only went up to volume 12 with the 3-in-1 books it's up to you if you want a matching collection or not. The paper is a bit cheap as well which is why it's cheaper. Plus you don't get the proper covers. They are bit heavy if your holding them as well.
Personally, I would just get the single volumes.
Travelling Man, Forbidden Planet and Waterstones often do 3 for 2 deals if you have any nearby that can help.
Just a warning though; they do call Zoro, Zolo. Doesn't bother me but I know it's annoys a lot of people.
I thought about getting a few volumes in Japanese, but I never got round to it. I do have some of the data books and Colo(u)r Walks. Thought about picking up some of the LOG books but the shipping costs too much.