The Mizuno MP-53 Irons claim to offer more forgiveness from a compact head and we would have to agree. The clever 360 degree grind makes the top line and sole appear smaller than it actually is and this enables Mizuno to increase the forgiveness whilst maintaining the appearance we have come to expect from the better player MP irons.
Mizuno MP-69 Irons
Mizuno JPX 800 Irons

Consequently, as equipment has developed, I've tended to be perhaps over conservative in my preference for the look of a club at address, demanding that it gives me confidence - usually with a thickish top line and an oversize head - to strike it with power and passion.

Smaller heads with a thin top line serve only to make me edgy at address with the result that the feel that a pro or a low single figure golfer has with a well-struck shot is rarely experienced by such as me.
Mizuno MP-53 Irons
Mizuno MP-63 Irons

The MP-53 irons, however, is more my kind of club and my first impression, as will many in the mid-handicap range who try it, is of a club we should aspire to with a top line we can handle and a bigger sweet spot from a smaller head.

It's a beautifully-crafted, muscle-back club, with a sound all of its own and is Mizuno's first 'game-improver' with an MP prefix. I was worried about if moving into the MP line was a step too far, Mizuno MP-68 Irons but I found these just as easy to hit as most GI clubs I have tried recently. They offer enough feedback to let you know you have hit it off the toe/thin etc but don't rob you of that much distance.

The Diamond Muscle design has been created using Mizuno’s Harmonic Impact Technology and works by reinforcing the clubhead from heel to toe and provides excellent feel, control and sound at impact. The MP-53 features a 360 degree grind that lessens the width of the sole and top edge while the shorter irons feature a design similar to the MP-63 irons to ensure that they offer complete precision and control.