I picked up an EZCR2 neutral from 4 Sevens soon after they came out, and it has been living on my keychain ever since.
It almost never gets turned on, and I'm still on the same cell I started with.
The threads aren't the smoothest, but they aren't really bad, and the light is operable one handed. The anodizing is taking a beating. I thought HA would hold up better, but considering it rides around with a bunch of keys and maybe a knife clipped in there, too, it's grinding against a lot of metal all day long.
One thing I've been pleased to see. I've dropped it no less than half a dozen times from 3 -4' off the ground onto wood, tile, concrete, you name it, and I haven't had a single problem. It's a pretty tough little light.
I just now noticed that there is an R2 version, which looks to be insanely bright on "high" in the 123 model (even assuming NC is listing emitter lumens), so I might have to get one of those.
Does anyone know how the beam quality is on the R2s? I'm assuming it's an XR-E R2, not an XP-E, which NC is putting in it's D10/EX10 SP and NDI these days. I'm a little worried it will be ringy. (My neutral is ring-free, BTW).