I have an Epipen. It was prescribed when I went into anaphylaxis after I had about 200 stings in one go. It has to be kept in the fridge and the GP warned that I was only to use it if I did have such a strong reaction that my airways were closing and made clear I was not to use it on anyone else. Apparently there are risks associated with its use and if I stab someone in the leg and do them more harm, I would be liable.
Having suffered both, I think there is a big difference between being badly stung and and having the potentially life threatening anaphylaxis... with the later I was covered in a red rash - very red, not like a bee sting - around my joints, not just where I was stung either, my eyes swelled so I could hardly open them and my ears swelled to my ear canals closed and I couldn't hear properly, then my mouth, tongue and windpipe started to close and I went into shock...shivering. Apparently since it has happened once it might happen again and it didn't happen immediately, so I keep the pen at home in case it happens. If I saw the first symptom hives (red rash) at the apiary I would dial 999 or get someone to drive me or the victim straight to the hospital 10 minutes away. The treatment for the anaphylaxis wasn't nice either, so I now try to avoid getting stung so much.
It would be a right pain taking it out to the apiary in a cold bag every time I looked at the bees. I wouldn't really advise people to get one unless they really need it.