I have tried to use it now about 10 times on a selection of 7 different knives of different sizes. The knives are slightly sharper afterwards but not like the sharpener I already had for 5 years. It gets them sharp as a razor and lasts for weeks. Additionally the mechanism gets hung up on the up and down movement on several of the movements??? I have tried every angle but every knife hangs up at least once every time.
** my home is full of Shark/Ninja products and this is the first in 10 years that is not 5 star - but is NOT.