I've actually seen where something like 90-95% of all percentages are made up on the spot, but I believe his 95% could be in the 5% of truth.
I have played Titleist 690MB for about 6 weeks now. I'm golf 18 holes once a week, 9 holes once a week and hit the range once or twice if I'm not too busy. I'm playing to an 11 handicap now.
I learned to play 15 years ago on Top Flite Spalding blades. I loved them.
5 years ago I switched to Ping Eye 2 and never really got on that well but I wasn't playing much either. I started playing regularly again Fall of 05. So I bought Nike Pro Combos. They were ok.
I traded them this summer for the 690 because I believe that Blades make you learn how to hit the ball better.
Yes you can shape your long irons better, it feels smoother when you catch it right and when you hit it off the heel the ball responds worse than a forgiving cavity back.
But if you hit it off the heel or toe or thin with a cavity back, what have you learned?
Hit those shots off a blade, you will feel where you hit it and learn how not to do it again.
So blades are if you want to get better and can practice enough to actually get better. I would say if you fine with just making up for inconsistencies in your game and only play less than twice a month and no practice, then get a cavitied irons as you can. Like those Cleveland or Adams hybrid sets.