This is the best knife set I've ever used.  I'm so happy with this set.  Ninja has very thorough videos on the NeverDull knife system and the safe use of the sharpener.  I highly recommend taking a few minutes to view the videos to properly use and care for these knives.  The knife block included with the set has a built in sharpening stone to keep your knives sharp. It also looks great on your counter!  You won't use the sharpener for a while because these knives arrive very sharp.  They are nicely balanced and easily take care of every cooking task.  I've used them on vegetables from green beans to butternut squash.  They handle everything I've tried.  I was really impressed with the ease of cutting up a butternut squash.  It is recommended to use a wood or plastic cutting board to keep your knives sharp. I expect to use these knives for a very long time.