Well, yeah, but this was to be expected given the price (a 7x7 under $10). I'm not terribly interested in this cube itself (I might try it out later at a local physical store), but it's the size that's exciting imo. Given the overall trend, it wouldn't surprise me if the next generation of 7x7s will approach 65 mm and maybe one of two of them will go lower, and 6x6 cubes might start fitting into those 64 mm Yuxin boxes.But don't be fooled, no magic, this line is cheap with all the consequences. I have 4x4 and 5x5. Assembling quality is quite good except of unequal tension of the 4x4 and extremly loose of the 5x5, but the plastic is hard and cheap, center caps of the 5x5 tends to fall out. IMHO.
In Cubing Classroom overall, MF8 was "alright" and MF9 was actually really quite nice, imo. It's pretty sad that most Youtube reviews / unboxings mention that these two are very tight, and that's it. Once you loosen them up within reason, and break them in a little bit, they are quite decent. MF8 is a bit too flimsy for its own good perhaps, but MF9 is actually *great* as far as budget cubes go.