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For reference I still carry my 123 tac daily. It has been beaten and abused, I once even used the bulb end to beat weld spatter off a machine at work(for a minute or so before the "what the #$% am I doing" kicked in).
It does have a permanant clip(the 2 cell flashlights are reversable) that puts the flashlight in bulb up orientation in the pocket. I actually prefer that method as it makes it so that when I grab at the flashlight my thumb naturally goes in the pocket and rests on the clicky. For 1 cell flashlights I prefer bulb up now though I never figured I would. Also I have zero worries about the durability of the bulb end since like I said above I have beaten the piss out of it. It does have scratches and nicks but has always worked. Also since I only keep the flashlight in my front right pocket(an nothing els in that pocket) I now keep the lanyard attached to the light and stuffed in the pocket. This makes it much harded for me to loose the light(I lost it for about a week once and had to use my turbo for daily carry, I missed the 123 tack alot).
Just FYI, I bought my wife a preon a couple of months ago. I was very impressed with the brightness and will likely buy myself one as either a backup or replacement to the 123 tac for work carry. The preon was just exceptionally bright and the AAA'a would be easier to get work to pay for since I go through about 3-5 cr123's a month(and the guy who provides the batteries has only managed to swing 123's a couple of times for me). I have no idea on the preon's durability though because while I beat the crap out of my lights my wifes is usually sitting in the diaper bat next to the softest, fluffyest diapers she can find.
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Preon is a nice light too! Not for tac use obviously, but a great house light for general use. You can get the 2xAAA version and then buy the 1xAAA battery tube and be able to use either 1 or 2 batteries if you like. I did that with my Blue Preon, though it generally runs in 2xAAA mode as it is easier to find after the Monkeys get ahold of it and play with it.