bought 6x6x6 cube. it is definitely a good quality product. My main issue with it is average ergonomics. It is only slightly bigger in volume compared to your typical regular kubik (3x3x3) but it has 4 times more squares on one side of the cube. That means little squares size is a small one and sometimes this becomes an issue when you are trying to arrange the cube with thicker fingers. Also it is a bit to loose for rotation (at least for my taste).Original cubik rubik requires more force to rotate one squares plane. So after long usage of this cube frustration start to kick in.
i thought IT would be bigger but it is good. slides well