I have a TiS on my survival key chain along with a peanut lighter and Tinker SAK.

This has H,M,L and strobe. Nice little AAA light and pretty bright for it's size. On my car key chain I have a Fenix E05 which has H,M,L modes and more of a diffused beam. It is also a small AAA light.

I have the Nitecore EA11 in my EDC sling bag and may on occasion start carrying my Nitecore EC11. I'll have to see what works the best in that regard.
As far a why I have both the TiS and the E05, I like the mantra of 2 is 1 and 1 is none. They are compatible with a AAA battery and I'm sure to have at least one on my person when I'm out. The EC11 might be a good idea as well as was evident last night. It would have come in handy while we were out on the property in addition to the Nitecore SRT 3 I had in the car. The SRT 3 is a great light but started flickering toward the end due to the battery losing juice.