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The two best instructors that I know personally shoot and carry MP9s. They've both retired 2 or 3 each after 80k rounds or so. That tends to influence their frequent flyer students.

I never advocate a particular brand or model. I tell them to find the gun that works for them and then practice, practice, practice.

In an instruction setting, the trend will be toward full size striker fired guns because they're easier to run / manage ammo. Those may not be the right choices for their EDC situation though.