I have had a couple of the Streamlight TwinTask 2Ls. I liked them quite a bit as car lights, but I've since switched to these lights:
Nuwai 3-watt hi/lo
(I bought mine here - no connection to this dealer but my transaction went fine and they answered a lot of questions via email).
Pretty much the same size (the head has a larger diameter). It's got a good beam on high, pretty decent light output on low, and you'll never need to change the bulb. I'm a fan of these lights, and for the price (about US$36) - they're a good value.
The TwinTask 1L is a neat little light, but a bit big (head size) for really comfortable pocket carry.

For those looking for a pocket carry light, I think the Nuwai Q3/QIII is a very good option. A 3-watt LED running off one CR123 battery. Size is very similar to a Surefire E1, although the fit and finish on any Surefire is better. I've not tested an incan vs. LED for seeing through smoke conditions, but the output on a QIII is pretty good for a pocket light of that size.
Dave