I bought an x1 primarily just to keep in my car, but am disappointed. I bought at a frys electronics and right out of the box noticed that the push button didn't work. I had to twist the light to turn it on. At this point there is horrible scratching coming from the tail cap. I quickly unscrew it from the body to discover that the entire inside of the flashlight is covered in some sort of sand or grit. I clean the inside as well as the threads and lubricate everything. Everything seems to be ok. I turn the flashlight on--nothing. NO light now from the included energizer. I proceed to test several new Duracell until i get one to work. I think that something is totally wrong with the switching system, because the flashlight works now, but the rubber "tactical style" button is utterly useless. I have to push really hard, and then when I let go and sometimes it turns off and sometimes it doesn't. Strangest of all, sometimes even when I screw in the tailcap, there is a 1-2 second delay for the light to turn on, and sometimes there is not. What the heck is with this light? I like the form factor and the design, but I'm going to return this light soon, maybe get something else.