How stiff was it? Can you compare the rigidity to something contemporary?
I didn't find it terribly stiff.
It did measure stiff on my racquet comparison board I DIY'd. That measured deflection from the handle being held fixed. Weight hung from first cross string.
The only thing as stiff or stiffer
was my dad's Head Ti6 thing!
I'd have to check though the spreadsheet to get details.
It was a 660, which was a bit more string than I was normally used to, so more forgiving in that dept I guess.
I strung it with Head Rip Control, I remember. So again, a softer option.
Great feel and touch, as well as powerful enough for me.