Q5 LD20; I hate the beam pattern (cree rings), but love the light, and I don't feel the R5 is enough of an upgrade to make it worth while.
I stick a cutoff bottle top with HDPE #2 plastic over the end of it for a diffuser and wander around all night.
9 lumens, 50 lumens, 100 lumens, turbo.. I find the lighting levels to be nicely spread out, and just too useful, even if they aren't ANSI rated levels, they're bright enough.
Between all the lighting levels and my pop-on/off homemade diffuser, I have a light that is usable in almost every situation, and I just can't find a reason to upgrade.