Magnetizing the blade table can be an effective way of stabilizing the knife while sharpening. It can really speed the learning curve up for beginners allowing them to focus more attention on creating a perfect edge and less attention on holding the knife steady.
You may find the occasional knife where the magnetism will hinder your ability to sharpen. You can quickly and easily activate and deactivate the magnet by raising and lowering it, no tools required. Use the magnetic knife sharpener when it's helpful, lower the magnet when it's not. Installing the Edge Pro Apex table magnet accessory on new machines is VERY simple. The housing press fits (tightly) under the table. For older models, you may have to replace the leg screws (which will be provided) to make room for the magnet.