I just got my light from cellguy. Since I haven't seen any impressions or reviews of this light yet, and there were big concerns about the beam pattern, I'll do a quick write up.
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This light is tiny. It's dwarfed by the H600mkII.
It fits protected 14500's. I put in both Keeppower and Trustfire flame cells. Both fit great.
The fins had some waxy residue. It scared me at first because I thought it was some major flaws in the anodization. It comes off easily enough.
The anti glare coating may be the strongest I've seen yet.
The low is so low that I thought it was off, so I was using the next higher setting until I went back in to program it again. It definitely has the lowest low of all my lights, although I don't have a Jetbeam RRT01...yet.
The beam profile appears similar to the H600mkII, which is pretty close to the Xeno e03. That is, it has plenty of usable spill, and a soft hotspot. I think the beam pattern of the H600mkII is pretty good for hiking, and the H52w should do just as well. I prefer the incredibly even beam pattern of the Armytek Wizard Pro, but there isn't a 14500 version of that light.
The clip came off without marring the finish of the light.
Like the H600mkII, I think I'm going to have problems with accidentally turning on into high instead of low. I also had a related problem where I couldn't get it to turn on into low at all, it just wouldn't turn on at all with a slow click. The workaround is to do a quick click, and then eventually follow it with a slow click. A second workaround is to leave it on all the time in the lowest low, at least while I'm hiking. From there it's easier to reliably switch it into L1 or the other modes.
I wanted a small lightweight backpacking headlamp/flashlight that could use AA's in a pinch and provide enough juice for 4-5 days of long distance backpacking. I think this is going to do a very good job of fulfilling that role aside from the difficulty of turning on into low. Unfortunately I won't be able to verify if it has enough juice for those backpacking trips for at least a couple months.