I bought a new Magna-Matic blade balancer recently and have been balancing my blades with it for about 2 weeks now. I can say that the difference is amazing. I used a cone up until now and I thought that the blades were balanced pretty well. I was wrong. This Magna-Matic gets them perfect. Vibration in the mower deck is non-existent. If you're not balancing your blades with this tool...they're not balanced. The Magna-Matic is worth every penny. Everybody should have one of these.