I have been wearing a P100 half-face respirator for the last 5 and a half years. I don't think I'll be stopping anytime soon. I'm a secondary teacher, so I literally use a microphone and speaker, because I can't afford to keep getting sick every time Ms. Entitled decides that not having to watch over her sick kid is more important than the health of everyone at school and sends her ill child to cough all over everyone.