Max_501, Your response is a non sequiter.
I made no claim to the relative stiffness or camparison between the Head iSL and iSL RD.
I thought I was clear, that I was unsuccessful in locating the different skis in question to demo.
My question was " if anyone has demoed the '14-'15 Head iSL RD and what their experience was? Since they seem to have been ignored on the forum."
From your indirect response, I conclude that you have not demoed the iSL RD and that conjecturally you have determined they are "too stiff" and dismissed them without any actual experience, with their actual skiing characteristics.
I thought others were possibly doing the same and thought it worthwhile to relate my observations about the Head iSL RD 165cm 13.1R that concurred with RealSkiers.com Jackson Hogan and Peter Keelty's personal review of the ski. Most specifically that it was unlike other FIS SL skis in some of it's characteristics particularly forgiveness and versatility.
I am not making any conjectural claims how it compares to the Head iSL 165 cm 11.5R or iSupershape Speed 163cm 13.2R, only that it was much more docile than I anticipated.
If someone as old, stiff and slow as I am can handle and enjoy it, then there are plenty of others out there younger quicker and more flexible, than I, that can enjoy it.