I think for incandescents, the Streamlight TL-2 or NF-2 are the best alternatives to Surefires. They have some advantages and disadvantages:
- Streamlight TL-2 is smaller than any of the Surefire 2-cell lights, except for the E2e. And the TL-2 really isn't that much bigger than the E2e.
- Surefire has the best manufacturing quality of anyone, but the Streamlights are still well made.
- Streamlights have a brighter hotspot that has more "throw"
- Surefire has a smoother beam
- Streamlight is plenty less expensive: less expensive to buy, and less expensive to run based on Streamlight using inexpensive lamps versus Surefire's twice-as-expensive E2e lamps or 3-4 times as expensive P-series lamps
- Streamlight has an on-board spare lamp: very nice feature! Surefires don't.
- Surefire's switch feels a bit better than the Streamlight's, at least to me.
- Streamlight's bulbs won't break when you drop the light, whereas in my experience, and the experience of several of my acquaintances, dropping a Surefire can be a crap shoot. Hurts double due to price of lamp replacement.
Overall, over the past year or so, instead of always steering my friends towards Surefire right away, I tell them to also handle a Streamlight to see how they like it. And nudge them towards the Streamlight TL-2 unless there's a very good reason to pay more for the SF
For LED lights, the other LED lights in Inova's line that are based on Luxeons are a good choice (like the ones mentioned above).