re: Fitted for irons

So you want to keep your existing clubs and just considering re-shafting all of them at a different length and shaft type OR are you considering new clubs?

Having the data won't really do much unless you're willing to do something about it and even then I'd probably say you can get a bigger bang for your buck just becoming more consistent and then getting fitted.

You can get fit today, change everyone of your shaft lengths and in the next year your swing continues to evolve, your game improves and you need to be fit again.

If money and time is not that much of a big deal and you're willing to invest the money into new equipment sure...a fitting would be beneficial. If not, it won't do much. You can get your numbers just as easily with a couple of hours at Loft 18 or any indoor simultator.