Well I havent seen them, but if it says "miracle" think trash. I was going to make a longer reply, but briefly, these things usually are made from very hard stainless that makes them virtually impossible to sharpen. ALL knives get dull, except for the ceramic ones. They can loose their edge too if you mistreat them, then you have to send them back to the factory. Anyway, the best reasonably priced knives are from Forschner. They are used quite often commercially and are highly recommended by Cooks Illustrated (to whom I subscribe and trust). These are stamped metal blades, and therefore less expensive than forged blades, but the quality of materials and methods used make up for that. Many web sites sell them. Highly recommended