I use EWT, and have for several years. I use them almost every weekend. They have held up. my 250 light started acting up, and I sent it in, they rebuilt the tailcap, and sent it back all within a few days. I have a 250 light that I use on my rifle, and a 100 that I use on my bow. Superior customer service and an excellent product.
Sniper Hog Lights is another good product. My Dad has one, and it is a nice light.
I attach it to my rifle with a quick release scope mounts to the Picatinny rail.
I went to the woods because I wished to live deliberately...
Henry David Thoreau