In this video I attempt to tell my 7x7x7s apart blindfolded, I wanted to know how different they all are and whether I can differentiate them without seeing logos and colour schemes. It turns out I can differentiate between them all blindfolded. The Aofu GTSM and YuFu V2M were definitely the most similar but the YuFu V2M has stronger magnets and is slower, although I suspect that can also depend on lubrication.