My Opalec mini's are the lights I loan out when someone needs a flashlight for some close work. My Arc LS Second is the one in
my hand.
The Opalec's are a good conversion of an old brand-x flashlight into something more useful and reliable, but the Arc LS is an order of magnitude better.
My LS second's "defects" are really only in the finish, and in a
very slight flaw in the LED/lens assembly. Thing is, I
LIKE the varigation in the finish - it gives the little beast some personality, and the output is just fine.
Now that I'm using rechargable NiMH's in the LS's CR123 body I find that I'm using it a whole lot more because it has become very inexpensive to run, and an hour runtime before dropping in a fresh pair and recharging the old is just fine.