its not really worth it because its like a rubik's brand cube that still can't corners as well as any other type of speedcube. And the cube4you one is a clone.
I would just go with a Edison cube or a joy cube or the Cube4you skyblue type A.
Haha, in my opinion, the JSK is much better than an Edison, type A, and muchhhh more reliable than a Joy.
The nakajima model, was made with JSK parts.
EDIT: Trust me, I have an Edison, a Joy, and manyyyy type A's. Also, 2 JSK clones which were once my main speedcube. Inb4 Type C and C4U hybrid.