I'm an admitted fan of Mizuno irons. Years back I reviewed the MP-58s and enjoyed them immensely. Before that I've gone through other irons from Mizuno such as the T-Zoids. I only strayed from Mizuno once during that time but quickly came back with a lot of success and great iron shots.
The pure muscle-back MP-4 from Mizuno keeps the train going. I've gone from muscle-back to progressive/hybrid a couple times before. Normally there is a bit of an adjustment period and a player can feel the difference and give up some playability and/or feeling. How did the MP-4s feel and perform? Read on to find out.