I had the 2L-X and have HL-X. I gave the 2L-X to a friend for checking a small backyard for critters and poop when he takes his dog out. He loves it. I prefer competitors for a small EDC light, but before I gave it to my friend I kept it as one of my emergency lights.
I won't give up the HL-X. I prefer floody lights for fair nights or indoors. However, for searching things out, in the rain or fog, or identifying things 75 yards away, the HL-X is a great "put it to work" light that I don't worry much about getting dinged, rained on, muddy, etc. That being said, I need to unscrew the bezel a quarter turn for what I assume is the proper focus... I should put an O ring or something in it so I don't accidentally knudge it.
The HL-X is a p90 sized light. Not really meant for the pocket. It tail stands, is bright enough on medium for longer use at moderate range, and doesn't get as hot as the 1800-5000 lumen lights I have when on the highest setting for a few minutes at a time. It also takes 2xCR123's without an adapter. It's not the best light or brightest light, it doesn't have a clean spill, you have to take the battery out to charge it, but it feels right in the hand, has a very simple UI, and for some reason, I always grab it if I want to see things at moderate distance outside.
I would have grabbed the HPL USB to compare if they had it at my local Cabela's. Unfortunately they only have the HL USB. However, between the HLX-5 and HL-X, I'm not sure that I need an in between size that still takes an 18650. For that size, I will probably stick with the 21700 competitors. I should also mention that although I like the HLX-5 for outdoors, I prefer the older HL-4 for an all around light.
I refuse to purchase the Protac 2.0, as the 21700 has a wedge on it to make it proprietary, and the flashlight opens up a hole in the side of the frame to access the USB port on the battery for charging... kind of wonky, IMO. It's my understanding that it doesn't have the reach of the HL-X either.