It is not stiff, but it also is not flexy. It has a pretty unique feel in my experience. I'll stick by my guess and say Mike would have liked it. I have my doubts about him being satisfied with the PDR, but who knows. Besides that, other than the Radicals, can you tell me a racquet he has tried that isn't stiff? Of course you prefer stiff frames when that is more or less all you use.