Two years ago while I was in Sturgis they had them across from the Full Throttle Saloon that you could rent. I heard that a guy and his wife wrecked one eariler in the week and the Wife was killed.
Point being..... Somebody thought that they were safe enough to rent out to anyone. So I guess in under the right conditions and with a safe and well trained person they could be alright!?!? But I don't think I'll be getting one any time here real soon.
Maybe back when I was single and didn't have a baby on the way!