Hmmm, those motors are 1/3th the power of a Bosch 750, with a pricetag 1/3th of the Bosch 750.
You could join 3 of those on 1 speedo and get the same power as 1 Bosch 750 on the same speedo, but for 6.5kg, wheras the Bosch 750GPA weigths 3.8 kg.