Why?
Because I was stuck indoors in the middle of winter then. I have a 64* and have practiced (read FOOLED AROUND WITH) this club. It is difficult.
BUT
This is a great practice club. The hands MUST have a lead, the right arm must remain available, the right shoulder must come down plane, I must have squared the clubface etc. Miss one small detail and the ball goes straight up or like a bullet forward or straight right or somewhere over your left shoulder. This club will not only let you practice fundamentals but will REQUIRE them. Everyone should have one. Not to take on the course, because you will bend it around a tree sooner than later but to move balls from on your own little patch of grass. Many, Many balls.