Also, as to the ambidextrousness (ambidexterity?) of the P7 line...
Neither of the two non-ambi controls are ones that you would need to operate in any sort of serious situation. One is the take-down button and the other is the slide catch. The first is only used when field-stripping the gun; not something I do in a gunfight or a gun game (though, admittedly I've never been involved in the former). The second is only used when locking the slide open, not when it is released. To release from slide lock you just squeeze the cocking lever, which is completely ambi. Furthermore, both of them are in positions where it is easy for a lefty to manipulate them, anyway. *shrug*
This is unlike, say, a gun with an external safety, mag release or decock lever, all of which might non-ambi.
Mike