I just bought an L1 off the MP to replace the other one I sold a year or so back.
Next to my HDS/Ra lights, I'm thinking this is just about perfect to drop into a pair of jeans, or a jacket pocket in colder weather. I may have to pick up another one.
Had and E1L. Nice, but it just didn't fit well in my hand. Have E21s - great lights, but too big for regular pocket carry, and the L1 UI is better (my favorite, I think, next to HDS). Have an L4 -very bright, great beam, but, only one level.
The L1 UI is the only one I've found, other than the HDS, which really seems to work for both a general utuility light (EDC) AND a tactical light, and for the latter, I think I'd give it the edge over the HDS, for simplicity, and for the simple hard press bringing it into Hi mode. Under stress, fine motor skills deteriorate and if you just jab at the L1's swith, you get Hi, which is what you'd want. Not sure where I'd end up on either of my Clicky's if the SHTF and I fumbled the light.