I never use Siri, she can't understand me and I just end up typing it in anyway. My southern slang is just too much for her and my blood pressure can't take it. Rarely will she get anything I say, so normal behavior from the women in my life.
Multiple times daily. Ten minutes ago I asked, "Hey Siri, what's the population of Mississippi?" for a piece I am writing. I speak 80% of my texts now. The more I use it, and the more succinctly I speak, the better it gets at recognizing words.