I hit the following clubs...
Titleist AP2, 710's (they had the Dynamic Gold S300)
Callaway RAZRX Forged Irons
To my surprise, the AP2's were nowhere near my favorite clubs based on feel, and smash factor. Which I was surprised as I currently play 762's with S300 shafts. So I thought going into this fitting I would gravitate towards the AP2's. They were a huge disappointment coming from a guy who's carried my 762's for nearly a decade in my bag. and I love the look of the AP2's.
The Callaway's were surprisingly very solid... But they were not as 'finished' looking as the Mizuno's which I'll get to in a moment.
The Pings were too large. They just didn't set up nicely to my eye, and they felt like I was hitting my old Zings in my garage. Not a fan.
So now to the Mizuno's. First let me say this was the first time I have ever hit a Mizuno iron. And I really didn't think I would be this excited about my finding... But their MP-53, MP-59's were amazing. The ball felt like it was exploding off the face. As if I was puring it swing after swing. My favorite shaft was the KBS C-taper Stiff shaft weighing in at 120g.
After looking at the two Mizuno's I decided to go with the MP-59's given they're 2012 clubs with the Titanium insert for improved feel. I'd say being stoked about getting these baby's next week is the understatement of the year. I can't wait to get out on the course with this new set.