These knives certainly are impressive! I don't believe I've ever had a knife out of the box that was any sharper than these are. It's such a pleasure to no longer having to struggle with the old knives I have, especially when carving things like the Thanksgiving turkey.  I have not tried the built-in sharpening system yet because there's been no need, although I have no doubt that it will work. The built-in sharpener is definitely a plus!  A very good product that I look forward to using for many years to come!