I bought them in a pinch; I'm a teacher and needed students to program the drones for a presentation I was to give. It took me almost 2 hours to assemble them. Many parts do not fit together because they are too big or too small. I had to cut and adjust things. After putting them together, my fingers turned red from gluing the pieces in. The worst thing was that the pieces were cut wrong to make them stand upright. There are notches on the sides and center section to create that freestanding base; nothing would fit. I compared the part that was supposed to be fastened, and it turned out that it was twice the size of the groove, it was impossible to fit the parts together. Instead, I used twine to hang them from the ceiling. If I had time I would come back for something better.