The rate on the lowest level could m. E. be even langamer; If the motor stops to then to turn again in the Nature / Sleep mode, the start-up is a bit noisy, so I do not know whether he would be likely to fall asleep with the timer in the two modes.
A slight imbalance exists when the rotor, but this probably is also the fact that this is made of thin plastic. In the metal might be different.
It is unfavorable that the fan permanently consumes power even at rest, because it remains in standby mode. So only helps to pull the plug, which of course will not work in the timer mode.
Overall, however, you can be sure satisfied with the device.
