Hi Scott -
I got two CMG versions and thought they were almost perfect for some general uses, like walking a trail, doing close tasks at night. When Gerber version came out, got one of those two and it started to get quirky about turning on. Then I lost that one on a plane, got another replacement Gerber and in short order it started to get funky about turning on. Despite cleaning contacts and all the obvious stuff. Took it back and got another, and this one got quirky in the same fashion. I eventually played with it enough to cause it to fail completely, and that convinced me that something wasn't tight in the heads and the twist switch caused a wire breakage failure. Reason: with last one, pressing sidewise (gently!) on the LED itself would make it turn on when it wouldn't any other way, then that failed to work.
I am hesitant to slander the Gerber version based only on my experiences - I got all mine at REI and maybe they had a bad lot. Yours might be far better. For me, the original was great and Gerber did nothing to improve on it, perhaps degraded it. Just something to consider. Not sure that the prices originals bring is solely based on collectability.
Consider also the Peak AA (Killimanjaro I believe...) which is very similar to the original CMG in design. It doesn't seem to have the same long runtimes as it gets around 8 hours on alks, not sure why, but central spot whiter and wider (on mine at least). A good and comparable light.
- Bill