I've recently put a DGSL steel shaft in my driver a Bridgestone j33r 420 and it is working superbly for me - Low spin, lower trajectory, tight dispersion & great roll - I figured why pay mega $'s for a 90 gram graphite with the same tight specs and weight as the $10 DG SL - I find the heavier shaft helps me keep on plane and is easier to push against.
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"If we knew what it was we were doing, it would not be called research, would it ?" -- Albert Einstein
We finally had a few nice days so I worked with the driver. For me at least, I did much better with a heavier club. This was true on the range and on the course. I can definitely see where practicing that "heavy" feel with a very light driver could help my techique however. Thanks again for your thoughts.