I love my SL KeyMates. They stay bright for quite a long time as the batteries don't sag quite as bad as they do in other alkaline-powered lights due to the low current draw from the 5mm LED. Most of my KeyMates are upgraded with Nichia CS LEDs and thhey give a very good amount of light (almost too bright when eyes are dark adapted). Output with a CS is about equivalent to a Fenix E1 when both batts are fresh. Between the Keymate and Pelican, I'd pick the Keymate for it's size. My Keymates have been dropped, banged around in pockets and various packs with various other metal objects including knives and have no problems functioning. The black finish will show wear, but the silver always look great (until you look real close, but who will and who cares). Replacing the LED is super easy (easiest I've ever done). However, keep in mind the button batteries (cheap online, but not as easy to find as AAAs) and as mentioned previously, the plastic sleeve that electrically isolates the batteries from the tube wall.
For a good AAA light that's quite bright, take a look at the Fenix E1 and E0. The E1 is brighter while the E0 runs longer. I have the E1 and like it a lot and AAA batteries are easier for me to get. But I still also use my Keymates often. On my last trip, I brought my Keymate with me instead of my E1 because I know the Keymate runs for much longer. The E0 would run for a good time tho, so if I had one of those, I'd probably bring both an E0 and a Keymate for emergency backup long runtime lights. I usually also bring my Gerber IU with me on trips as I've personally tested the runtime on that and it goes for a loooooooooong time.