You either like hitting blades or you don't. If you do then rest assured that your getting a lot compared with traditional blade offerings from other manufacturers. And with some of the controversy recently coming to light how Miura only does the final forging step in house, allowing another foundry to do the first 3 or 4. And Scratch Golf claims of using 1018 being completely disproven in independent metallurgy tests as well as their claims of using a certain forging house in Japan being refuted by that exact forging house it's nice to know that Mizuno is out there. ( see GolftoImpress web site ' Scratch Golf Results ' for test data ).
But to get the absolute best out of your Mizuno MP 68 irons your going to have to experiment with a few shafts. Skip Mizuno's marketing driven new clip-on shaft fitting system and go to a real custom fitter. After much trial and error I have settled on KBS shafts trimmed to my taste and what a difference it makes. As anyone here knows shaft selection is 70% of a clubs performance and if your good enough for blades then details count and are VERY noticeable. Shafts go a long way too towards feedback perception. The MP 68's now feel even softer with the KBS ( KBS has Kim Braley on the design team who was responsible for the Project X design as well as many others ) and the feeling of confidence that the club heads sweet spot will lag into position at impact is now a certainty instead of a 'Well lets see what happens' type of affair.
The only other Mizuno blade design, current or prior, that can give you as good a feeling when you pure them at impact would be the MP 33's. I wish that Mizuno would bring that design back but as they admit the 68 is their attempt to improve upon the 33's legendary performance. They like to boast about a test done where both older 33's and the new 68's were given to a group of tour pro's on a range for comparison and how 80% of the pro's preferred the newer 68's to the older 33's for performance. Hmmm... I would have liked to have been there. I also would have liked it if they filmed this. But the die is cast and MP 33's in good shape are just to hard to find now.
I only play my new 68's up to a 4 iron before a Cobra hybrid enters my bag.
The right shaft also corrects ball flight and distance issues too. With a blade you want to remember that if your on the cusp of either being a fit for a Stiff flex or an X-stiff flex to always go softer. This makes the club more forgiving, while allowing for full carry in the longer irons on days when your swing is not it's best.