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@Zdrenka
Okay let me give you my side of the story.
I'm studying as a mechanical engineer and is therefor a man of numbers and data... mostly.
This is a stiffness comparison I found for the X4 and some other stems
http://caletticycles.blogspot.com/2008/08/stem-testing-torsional-stiffness.html
Its not the stiffest no, but it seems to be quite good value. Its heavy yes, but I need stiffness.
Also, how come most of the Australian National track team run them if they weren't stiff?
... or girls at least.