The build quality is top and also the design. It is not as stuffy and obsolete as with other devices. The rotor blades are not of plastic but of "stuff sacks". Thus, once accidentally :) a finger gets in the way, this is not from the same :)
Before I evaluate the performance, I come to the volume. Regardless of the regulator stage (1-2-3) also increases logically noise level, which is not to be assessed as negative. Even in the 1st stage, the device brings tidy performance with minimal volume.
Conclusion: Relatively quiet machine with plenty of power,