The Surefire LX2 Lumamax is my favorite Surefire light for several reasons. First off, it is a Surefire, so you have their legendary quality, customer service, and warranty. It also has 200 lumens of output (Surefire downplays their output, so 200 from them is more like 300 from most other companies), a really cool dual stage switch, and a TIR optic that gives you a great looking beam and good throw for a relatively small light.
The dual stage switch gives you a low output of 15 lumens when you lightly press it and the full 200 lumens when you depress it all the way. This will only give you momentary activation, but twisting the tailcap will give you constant on. Those two outputs will cover most of your lighting needs, which is why many of our customers use the LX2 as their EDC light.
The light is definitely not on the cheap side, but if you are familiar with Surefire and want one of their best lights, then take a look at the video and see if the LX2 is right for you.