I have owned the C2-HA a short time and so far the lanyard clip has popped off the lanyard ring three times, once resulting in the light crashing to a tile floor.
My old G2Z lanyard clip is a simple design and the new lanyard with the C2 has a latch that is wider than the rest of the clip. It is a rounded wire loop shape and when the lanyard ring spins around to the pocket clip the latch releases when it rubs the right way. I did not understand how the lanyard clip kept popping off the ring until I sat down and fiddled with it a bit.
Nobody at surefire made sure their lanyard clip doesn't release against the pocket clip? It was the lanyard that came with the light. The pocket clip is too long since the ring isn't on the tailcap. I fiddled around with my old lanyard on the C2. It seems more difficult to pop off and might not under real world conditions like the new clip already has several times. Now I don't like this light. Put me in the "prefers no clip" crowd. I wanted the type III HA finish on a light like my G2Z. It was my first flashlight with a pocket clip and I figured it would not get in the way 99% of the time I didn't need the clip. Darn.