The nuttribullet ultra is very powerful.  It does make a whrrrrring noise but since this is my first nuttribullet, I cannot compare with others.  I try not to overfill and have not had any overflow problems. Despite having used it about 10-12 times, it still gives off a mild machine smoky smell. Hope that goes away soon. 

Hope this nuttribullet will last a while as it’s an expensive small kitchen appliance.