As Josh said, one limitation of the Gen 3 is the inability to sharpen knives with wider blades. For that reason, after upgrading to the Gen 3, I made a few extra buys and now have both Gen 2 and Gen 3. With the Gen 2, I can sharpen very wide blades that will not fit into the Gen 3 vise. And at the present time there are no add-on devices that will enable that to be done on the Gen 3. The high angle adapter is great for small knives, but so far no adapter for large blades.