Useable is completely another story as I find it helps my stick handling and passing, and since I take snappers (like literally push the puck forward and snap my wrist) as opposed to the shots where you pull the puck towards your body and release in one motion I find it relatively forgiving as to where I strike the puck and accurate for all shots.
The velocity is lower (for the same stick) than more curved blades and it flies straight so the goalie can track it but I'm a dman and I want to be surer on the puck.
I think the PM9 is maybe a hair open. I have easton E4s on and they are IMO truly neutral.