I've got a Twintask 2D and I'm NOT that impressed. It's currently the only light I have that has an incandescent bulb. The incan is pretty sad. . . all yellowy and not very focused, not much throw at all. The LED portions of the light work quite well, with a choice of 5 or 10 lit up on successive button pushes. I've tried many times in complete darkness. . . I just can't see any difference between the 5 LED mode and the 10 LED mode as far as practical brightness. So for me, it's a waste (and an inconvenience) to have two LED modes.
That said, the light is quite solidly built and is probably quite durable, but it's at least as heavy as a 2D Maglite. It's not that it's a bad light, but I think for the money you can do better. . . Inova's X3/T3 (for a bit more $) are amazing regulated lights with throw way better than the TT, or Streamlights own PolyPro 4AA LED which has a brighter flood. Also, the TT does not have the "momentary on" (or "tactical") pushbutton that I find very useful. . . the Inova's and the Propoly do. The ProPoly is smaller and cheaper as well. Runtime is something I can't speak about with any authority, so that may be a factor.