By the standard of impracticality mentioned, every SF HOLA lamp configuration is then equally impractical and even more expensive to operate. Continuous discharges on a SF HOLA powered by CR123s are basically impossible due to cell over-heating issues, also, the body on the smaller lights heats up quite a bit...
In all cases, practicality is really in the eye of the beholder and depends on application.
Also, as mentioned, the 623 should have plenty of bulb life on the more conservative 12 cell pack.
The argument that *no-body* should buy one, but instead, build their own, is roughly equivalent to telling someone they should never have a mechanic work on their car, because it's over-priced for what you get... There's an argument both ways for this. I like to work on my own car, probably because I like the savings, my Dad always tells me that he's more than willing to pay the mechanic those big bucks because he hates that kind of work enough that it's worth it to him not to have to do it himself. I'm a firm believer that everyone should get their hands dirty and immerse themselves in some complicated projects at least once and awhile to keep them sharp and to learn new things, but I'm not going to force anyone to do it
-Eric