In my crash from 6 months ago, I went off the front of the wheel and flipped in the air and landed on my back. I had an armored motorcycle jacket on, but no airbag. I had zero external bruises. The problem was I hit the pavement so hard it jarred my internal organs. The pain was extreme, and I couldn't sleep for three days even with pain medication. According to Alpinestars, the airbag gives the same protection as wearing 18 back protectors. Also the airbag inflates really tight and acts as one unit. Much of the force of impact will travel around your body. On a unicycle, one is going to hit the ground much harder than a motorcycle going the same speed in a crash. You are basically a pendulum. So, for me, I don't think it is over the top of appropriate safety gear. I don't think anything that is practical to wear and provides more protection should be considered over the top. Each rider can decide what is appropriate for them, but we shouldn't discourage anyone taking steps to be more safe.