Exactly why we spashed out on the Joysticks. Not exactly cheap or powerful, especially compared to the Magicshines, but having seen the inside of my Magicshines, I'd trust the Joystick a hell of a lot more. If you are out in the wilderness on your own you need lights you can depend on. If you are in a big group its not such a worry as not all you lights are likely to fail. So I have a Magicshine for power (on the bars) and my Joystick on the head as a spot and also get me home light if the Magicshine dies.
They are great lights for the money these cheap copies, but dont use them as your only light source, even if you just carry a decent head tourch if the worse happens. We've had a few failures of Magicshines and I was always happy then to donate mine to whoever had failed and use the Joystick to get home.