Graphite versus Steel shafts on irons (post is focused only on irons)

[ligastar]

My entire life I've played with steel shafted irons. I'm looking at an iron set now and would probably go with the custom Nippon NS Pro 950 steel shafts. This iron set also comes with the custom option of Aldila NV 105 graphite shafts.

I know that graphite shafts are more expensive than steel shafts. I'm guessing this is because they are more expensive to manufacture. However, is this also a case of "you get what you pay for" in that the technology is superior? If this were the case I'd expect a high percentage of PGA Tour players to be playing graphite iron shafts which isn't the case.

What differences could I expect to experience converting to graphite shafts after playing steel shafts for the past 20 years? Does anybody have experience in making this transition? If so, what feedback on this experience would you have for me?

If it makes a difference my swing speed dictates an S (stiff) flex on my irons.

Thanks,
ligastar