i don't think he would've liked it given the sticks he has liked in the past are all very stiff
PSC 6.1 (stiff)
PDR (stiff)
probably best he didn't waste money trying the 315. while the 315 is not a noodle, it's definitely not what i consider a stiff frame.
mikey should be thankful TW helped save him money.
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.