No bulbs. No filaments. No reflectors. No glass. If you remove all the weak points of a standard flashlight, and all the old notions of what a flashlight should include, then start designing from scratch, you'll probably end up with something like Inova's X5.
It doesn't look much like a traditional flashlight - a smooth aluminum tube with eight flat sides machined into the center, capped at the ends with a rubber button switch at the tail and a stainless steel bezel at the front. Aside from the lanyard hole that goes through the knurled tailcap, it's about as simple and straightforward as it gets, measuring a full inch shorter than the MiniMag and a quarter of an ounce lighter. It resembles a flashlight circuit that's been carved into a solid slug of metal.
Which is exactly how it feels when you hold the X5. The aluminum is military-grade Type III anodized; if you're a long-time MagLite user, you might have noticed that it's Type II exterior collects nicks and scratches over time - no such problems here. With no glass or filaments, no "breakable" parts, the little Inova is about as rugged a light as modern technology can provide. A water-resistant 1+ ton crush rating means backing over it with your car in the rain will leave the X5 unfazed.
But the highlight is the light - *The X5 has as much light output as a full-size 3 D-cell Maglite.* The light beam is phosphor-white, similar to an HID car headlight, and produces an even, round flood on whatever you're lighting. The five Nichia CS LEDs are "lifetime" rated (100,000+ hours) and are actually a patented design utilizing fluorescence techniques in manufacturing, meaning they're uniquely brighter compared even to other LEDs. Note that this is a tactical light; shining it in yours (voice of experience) or someone else's eyes will produce momentary blindness even in a lit area.
All the light innovation wouldn't be complete without some battery innovation - The X5 is powered by a pair of 123A lithium batteries (sold overpriced at your local store in the "photo batteries" section, find them online at less than $2 each) providing six watts of power. Unlike flashlights of old, where you could determine battery life by how bright the light was, Inova employs a power regulator circuit - no more slowly fading light over time, leaving you to wonder if the flashlight is really as bright as it could be; 3+ hours into use, the X5 is still as bright as when the batteries were first installed (whereas the MiniMag is at roughly 25% of it's original brightness, and completely dead a couple hours later). Expect at least six hours of useable light, and since they're lithium batteries, months of shelf time for your X5 won't make a difference.
So if you're tired of the limitations of 20th century flashlights, and are ready for something brighter, tougher, and longer-lasting, Inova's X5 outshines them all. Five "extreme conditions" stars.
(Addendum: What about the new LED MiniMag? Maglite's new LED series of MiniMags are brighter than the X5, but only for the first hour or so of operation - their "energy management" circuit doesn't quite live up to it's name, so the light gradually dims over time like most other flashlights. LED MiniMags are also larger and heavier than the incandescent originals, and still use a plastic lens prone to scuffing. Powered by regular AA cells, battery life is at most four hours until completely dead, plus there's no polarity protection; should you accidentally place the batteries in backwards, the light will be destroyed. The LED MiniMag is a definite improvement over the original, but not quite on par with the X5.)