I like the functionality and color, but the basic quality of the product is poor. There are three points I didn't like: 1) The stickers with the letters on them that are attached to the packaging for each part come off easily during delivery and assembly. (I couldn't tell which parts were in the instruction manual) ② The design of the F part, which fixes the perforated board to the metal rods on both sides, is poor. (Part F is made up of two plastic parts, and the structure is such that the plastic part with the female groove is inserted from below into the other part with the male groove, and then fastened with a screw. Because of this structure, if you loosen the screws just a little, the two parts will easily fall down, making it difficult to assemble and adjust the position of the perforated board. (The same applies to Part G.) (3) The screw holes for fixing Parts F and G to the perforated board are not precise. The included hexagonal wrench sometimes slips and the screws cannot be turned. Or the holes may be crushed.