First I'll point out that Fenix is a Chinese company, not US. It matters to some people.
Also, I don't think Fenix-Store is affiliated with Fenix - I think it's a retailer that just picked that name. But, they do have a good reputation.
http://www.lighthound.com/ is another good retailer.
The Fenix lights have good output and reliability for the price. My biggest concern from an "emergency" or ETS perspective is waterproofing an durability/ruggedness. An emergency light needs to work, even if it's cold & rainy, even if it gets dropped on concrete, even if it gets dropped in a puddle. And it may need to work even if you've forgotten to change batteries in a couple of years in your kit.
Probably the best small emergency light today is the NovaTac. Waterproof to 100' as I recall, and a proven rugged design based on the HDS EDC. Probably the only downside is that it uses a single CR123 battery and changing the battery in a wet environment (emergency at sea) might require some inventiveness. But that's true for any battery and light.
Keep in mind that LED flashlights vary considerably in beam shape even if they use the same LED. Some are "throw" specialists that can light up targets 100' feet away but have such a narrow beam as to be useless when looking for a screw dropped on the ground. Others have a broad "spot" and considerable "spill", great for walking a trail but not much help beyond 50'.
The 1 watt, 3 watt and 5 watt Luxeon LEDs work fine but are older technology and not efficient. Cree and SCC are newer and much more efficient - a Cree or SSC at 3 watts is putting out more light than a Luxeon 5 watt. The new kid on the block is the Luxeon Rebel LED which is the most efficient as I write this. Efficiency means longer run times as well as brighter output.
I would select an emergency/ETS light based on what you want it to do. Does it need to have a runtime that supports reading or trail walking all night on one set of batteries? Are you going to have to search for trail markers at a distance? Will you be on water, or in an extreme cold environment? Are you caving or such where failure of all light is catastrophic?
My pocket light is a NovaTac 120P. All of my emergency lights are Surefire, with a C3 & 1 watt LED in the car and a couple of G2 incandescents in the house. I keep a pack of a dozen spare CR123 batteries in the car and in the house. I have a couple of Fenix lights as workbench lights.
PS. For extreme cold environments keep in mind that AA batteries generally perform poorly (except perhaps Lithium AA). If the light needs to work reliably below 0F consider a light using CR123 batteries or some other Lithium battery.