Tektite make some interesting products. I spent a lot of time looking at the specs for different flashlights that they make because I like their basic philosophy, which is to make them very waterproof and tough.
however, for general purpose flashlights they need to make serious improvements before they are competitive.
The LS4, for example, is very heavy and achieves very low lumen ratings (both for overall and for throw) given the weight; also, runtime is not exactly stellar. The reason is that they still use a Luxeon-III (not even a K2, much less a CREE).
Plus, they tend to be expensive - e.g., they have lights with multiple-LEDs (don't know why they favor that formfactor) - just check out how much they cost and you'll see what I mean.
Overall, I'd like to own some of their products, but not before they start using the latest high efficiency LEDs - I hope they do so soon.