This is the second Fenix flashlight I've purchased. The first was the little tiny one that goes on your keychain. I purchased this because I was very happy with the first one. I left it in my pocket one time and sent it through the washing machine. I didn't realize till I saw it sitting at the bottom of the tub after the cycle was over. I fretting thinking that I just wasted $30. Much to my amazement it turned on without any hesitation. After that I was sold on this brand.
I started a new job in high rise building maintenance and needed a stronger flashlight. I opted for this TK11. I call it the TanK! This thing is incredible. I use it cumulatively during the day for about an hour. Off and on etc. The batteries last about ~5 weeks with this usage. It's very bright and focused and really illuminates clearly the dark areas of our building.
That's all well and good, but many flashlights can be bright. The Fenix TK11 however is extraordinarily durable. I already talked about sending my first little Fenix light through the laundry. This one I did even better. I was looking over a storm drain pit that we have. I was about 15' up over this pit. While moving across the opening I dropped my light. It fell the 15' onto a concrete pad then rolled into 2' of water. There it sat for about an hour till I got down to fish it out. The dang thing still lit up UNDER WATER! I took it back and just dried it out. Not a problem. It's a tough son of a gun. It's pretty pricey for a flashlight, but dang it's worth it.