If your not yet convinced that the Miura CB57 irons are not among the finest irons possibly available, then consider that the best professional golfer of all time, the great Mr. Jack Nicklaus is currently hitting them and hitting them well enough to make a hole in one at the Masters Par 3 contest here in 2015.
Well he should know how by now, he won his 6th Masters at the age of 46 and he is currently age 75. At this stage of Jack's life he can certainly afford to hit any clubs of his choice, and he certainly wants to hit the finest possible. That's why he chose the Miura CB57's, and it was a great choice as evidenced by his ace, seen here:
Now Mr. Jack Nicklaus has won 18 professional majors, the most significant record in golf of all time. Even the great Tiger Woods has won 14, still trailing by 4, and with Tigers troubles who knows if he will ever get 4 more majors.
Here is a photo of Jack's bag from the Masters Par 3 contest: