I imagine that this wouldn't be a necessary item if you have sharpened more than a few knives on the Edge Pro. I however, just got this system and the magnet has helped loosen the death grip I was experiencing before I added it to the mix. It works well with the stock rest but don't count on it helping much if you have the small knife attachment installed. The magnet was strong enough to hold an Opinel No. 8 Carbon in place all on its own during sharpening (probably not recommended though).