June 21, 2014
I have two XT11's: the older XM-L version and this XM-L2 version. Both are very bright, solid, well-built lights. The XM-L2 version is quite noticeably brighter than the older version. Momentary on is one of my favorite features and is a requirement for any light I'm going to use for work, or use extensively (I don't like clicking switches for most of the uses to which I put a light). It is a useful feature that the light comes on in high mode, especially for tactical/patrol use for police and security (or anyone working outdoors at night where the brightest setting is the most likely one you'll need.
Quick access to the strobe function is provided for also, eliminating the need to cycle through modes to get what you want. That being said, if you're using this light to walk around indoors, you will need to click the main switch on, then use the smaller one to scale it down to a lower brightness level, but that's o.k. as easy as these LED's are on batteries you won't waste battery power noticeably.
I first saw this light demonstrated by Sootch00, a reviewer on YouTube who did a very thorough demo of it which persuaded me to buy it. This was my first high-end LED flashlight (and the true beginning of my flashaholic addiction). I have the batteries out of both Klarus lights now and have them stored for future use. My EDC is a Nitecore P12 at over 900 lumens (I like the NItecore's mode selection method and memory better for my uses, but the quality's virtually the same as Klarus - both brands are excellent).
These Klarus lights are wonderful, bright lights and come with great cases and lanyards. Study the features and mode selection methods to see which brands/models of lights give you what you want. One of the first high-powered LED lights I bought was a cheap Ultrafire which required cycling through five modes to get the one I wanted. It got old fast. I have noticed is that once the novelty of having a bunch of modes wears off, you really will want to be able to quickly get to just the mode you mostly use and not have to cycle through modes. The Klarus lights do this for you in a certain way. Other brands do it a little differently, so read up, and watch demo videos before you by any high-end light, to ensure you're getting something you'll like. Klarus XT-11: Recommended.
Pros:Nice and bright
Instant access to high and strobe modes
Momentary on and click-on use
Cons:Lower modes require a little more switch use, some cycling (but not terribly cumbersome)
This and other lights like it have a slightly floody beam, which is only a negative if you want to reach far out (several hundred yards); if that's what you want, you need to look at larger, smooth reflector designs, like that found on the Niwalker 750N1, the Olight M3X Triton, the Thrunite TK32, etc. (and pay more).