Works fine for me also.
Have you ever tried it ?, its not a stall recovery method from a spin, its more of a technique to avoid stalling into a spin.
Go up to a safe height and try it with power off, with most hi-lift wings ( even a C150 ) you'll be doing well to actually stall the aircraft with this technique ( power off, full back stick and maintain directional control with the rudder ).
If you try it in an aircraft with more laminar wing, do it with even more altitude just incase.
Swept or delt wing, not a good idea.