I recently bought some vintage MacGregor 985 blades off of eBay. I wanted to use them for practice and I actually liked them. The shafts needed to be changed and the only other thing preventing me from making them my 'gamers' is that my current Mizuno's just feel better when you catch it flush.
Either way, my downswing improved by practicing and playing casual rounds with the Mac 985's.
I kept hearing how the vintage Hogan blades had really good forgings and I would be happy with the feel when I caught them flush.
So I got a set of 2-PW (Equalizer) of some 1963 Hogan IPT blades.
I instantly fell in love with them. They feel as good as any current forged blade I've tried (I've tried just about everything, including Miura and KZG, but haven't tried Scratch Golf). But they are certainly less forgiving than my current MP-62's. They also have extremely sharp leading edges which I love and I think help golfer's learn how to control their low point better. And they are heavier with flatter lie angles.
I especially love the 2-iron because when I use it on the range and start hitting it well, my swing improves with every club. Just fantastic.
So personally, I HIGHLY suggest getting some vintage blades (particularly Hogan blades) off of eBay which you can usually find anywhere from the $30-$100 range and just practice with those and play some casual rounds with those. I think you will be much more precise with your downswing because it requires you to be more precise.
I'm working a bit on some adjustments to my swing as we speak, but once I get my swing pretty much to where I want it to be, I'll probably get myself fit for clubs with my 'new' swing and then put a new KBS shaft in my vintage Hogan 5-iron and see how it performs. If it does well, then I will ship my vintage Hogan's off to get re-chromed, re-grooved, re-shafted, etc. And it will still cost a lot less than buying brand new clubs.
But I think everybody should at least have some tough to hit blades with them for practice, it will be the best purchase under $100 you'll ever make.
3JACK