Similar to one of the early posters, I've moved into a blade b/c the performance is just better FOR ME - i can't explain it, it seems to defy logic. Whether its entirely in my head and the improved confidence has helped, i can't say.
As a 0.5 handicap, I used to play Callaway Apex Pro's and then moved to P790's 1.5 years ago... i believe i was seduced by the distance. But, in the real world, i just never could get along with them - distances were all over the place for me, quality of strike wasn't real good, and then i'd get that occasional 7-iron that would go 195 yards... So 6 weeks ago i did a fitting again, and once again on a trackman, my gamers were just spectacular. But the next best thing was the MP-18 musclebacks. I decided to pick up a 2nd hand set of MP-18 MB's, and while i only have 3 rounds on them, I can't remember my iron play ever being better!! Now, what was a strength early in the year in my Driver, is starting to get a bit squirly from time to time, but so long as I drive the ball well, i have high confidence that I'm going to hit a great iron shot. Playing the MB's from 5-9 with a vokey 46* wedge and then still playing the 4 & 5 iron of the P790 (yes, two 5 irons, since the P790's are a full club stronger lofted in these irons). So, in effect its a 3-PW set that i'm pretty darn happy with (other than the Vokey - i'm undecided on it)