I never shave. I just run a little beard trimmer around now and then. I do have a 'cammo' cordless Norelco. I believe I bought that to properly shave when my Dad passed away back in 2012. Haven't used it since, and out of curiosity from this thread I checked it. Deader'n a door nail. I'm going to see if it'll take a charge.
The only time I can remember shaving my mustache off in my life was for basic training, and I usually always have some kind of chin hair or a full beard. Full beard in the winter for sure.