I used to have one but after getting a better EDC light it was just too much of a PITA to drag the keys out when I had a bigger better light in the other pocket.
I have a bunch...somewhere, I think maybe in the shed...4 L0D`s...one is a Titanium limited edition from...maybe 4 years ago or more...think the rest are from different years. Several Arc lights...think one still works. Several Photons...dating way back to around the dinosaur age.
But in actual use...Fenix E-01...looks rough from scratching against my keys...but a super dependo. A 12 lumen Nitecore AAA...love it to much to get it all messed up so sits around being lazy. And a totally awesome SS Rofis...used pretty much on just the 30 lumen level...pure white beam...great light. It`s another one that just lounges around doing nothing much.
Funny...that old E-01 on my key chain is still the the work horse of choice...just cause I have no love for it...lot`s of respect though.