LD01 running a 10440 is always in the front pocket... never noticible. And I use it during the day more often than one might expect, just to aid a bit in seeing dimly lit things/areas.
When night falls and I go outside, I would have at least two more lights along as well... lately my Quarks are getting a lot of that time... Q123-2/17670 warm, QAA/14500 warm, and Q123/16340 warm are all equally enjoyed these days. Going for a night walk of any sort I'd definitely grab an L-Mini II/18650 with turbo head or a Jet I Pro v3/14500 for spotting, as well as one of the Quarks and the ever-present LD01.
I've got a lot of 6P size lights and Surefire 6P and 3P clones, but they have seen very little use since I got into the D10, LF3XT, Quark lights. I much prefer the somewhat smaller form factor of these and the output/powering options versatility.