This cube is coming out in the 40th anniversary year of Uwe Meffert first designing the Original Pyraminx. (which has sold millions) This is a well made rotational puzzle, the layers move very smoothly. It is not to be used for speedcubing but it is still a nice puzzle to work with. The stickers are very high quality as you would expect from a mefferts puzzle. The reason why it is called professor pyraminx is because the original pyraminx has 3 layers, like a Rubik's Cube and this one has 5 layers, like a Rubik's Professor Cube.