Joshjrn: Sometimes I really notice a difference (and my performance suffers) and other times I'd swear they were identical.
I wonder how much better one set of irons are to another. Upper level irons are probably the same. After all, there are too many variables to factor in, such as the wind, distance control, spin, and other things. Find a set where the meter speed works for you and your 3i goes at least 200 yards. Happy hitting!
Doug