The price spread compared to other lights... I would pay more for the Surefire name...if it was more reasonable. But to me their way too high priced...
Also as others have pointed out...they really try and force you to stay with the 123 batt.... I am one of those who are moving on into the future with Li-ion.... I know rubbing sticks together will still start a fire...but I use a lighter. And I also uses Li-ion.
About the way I feel as well. And there are so very many really interesting, appealing new models of flashlights coming out now that make Surefire not so exciting anymore. Makers like Nitecore, Liteflux, JetBeam, Fenix, Eagletac, RA, 4Sevens are doing things with lights that are very appealing and priced so you can buy perhaps two or more of them for the cost of one Surefire.
And while I think CR123 is a good power source under certain circumstances,
I like having a fresh li-ion power source in my main lights at all times, not a primary cell that has been partially depleted but still has some life in it. And I don't want to be tossing depleted primary cells left and right. I only keep CR123s and other lithium primary sizes as an emergency/back-up stash for a time when for some reason I can't use or recharge my li-ions.
Li-ions are it for me... I'm a huge fan of li-ions for powering my flashlights. And I stick mostly with lights that can be powered by a single-cell li-ion (16340, 14500, 17670, 18650 etc.) In this regard, most Surefires are a dead end road when it comes to powering options.
One glaring hole in the Surefire line up is a well-featured AA-size light that will run on 14500, NiMH, AA lithium, as well as the lowly alkaline. A light which offers multiple output levels, very small compact size, a brilliant high all the way down to a squeeky loooow low. One example of this is the Quark AA which by virtue of it's size, powering options, and levels/modes options makes it one of the most versatile, useful, flexible lights one could hope to have - especially in a bad time when scavenging for cells only comes up with the lowly AA alkaline. But in normal times, the 14500 is THE standard cell of choice for being able to start every day with a fully charged, very potent light. Sorry, but the ICON ain't doin' it for me.
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I do power my Surefire L1 with li-ions, but my E1B can't run well on them. In fact, I never use my E1B anyway as I prefer the Quark123, QAA, Q123-2, D10, LF3XT, JetI Pro and Jet III-M, and L-Mini II lights.
My other Surefires (Z2 Combatlight, E2, E1e) have all been converted to run other-brand lamp assemblies (Malkoff, Solarforce, TLS, Dereelight, LumensFactory lamp assemblies) and running on only li-ions now. For additonal 6P lights, now I buy Solarforce L2 and L2m as I feel their quality is excellent, they're Surefire lego-able for aftermarket drop-ins, and 1/4 the price.
SO basically, I started out with Surefire lights and then in the last year, and now have moved ahead into buying numerous competing brands with more innovative features, UIs, sizes, powering options, and much lower prices.
Surefires are great quality lights, but they have lost much of their appeal to me as compared to much of what the competition is offering at much more appealing pricing.