Got mine yesterday and considering all the complaints about quality I had to take it apart just to check!
TBH it's pretty good in my (amateur) opinion. A few things seem to have changed since the review mentioned above (on candlepower forums and also the mtbr threads). Mine has a longer lead than mentioned, no swarf whatsoever, thermal transfer paste is evident on the heatsink, the screw that mounts into the light unit is longer and has a good grip. There's an extra plastic(?) washer / insulator between the LED and the reflector. The mounting O rings are also different to those pictured- seem beefier. The charger and battery stayed cool during charging.
Overall I think that the manufacturers are listening to / reading the comments they've got so far. It's definitely better than any of the P7 torches I've bought over the last year (a driver in one of those has died completely so I had so rewire it for direct drive and dont expect it to live much longer).
As for performance - its brighter than either of my P7 torches - I'm not sure if it's meant to? Run time seems to match claims so far. It does have a slight green tint.
Realistically I think it's too bright to use around cars - it really does dazzle folk. On my way back from the hills I had a few oncoming cars stop and later a dog owner complain about her dog getting dazzled! How she 'measures' that I'm not sure. I think Im going to try adding some sort of mask / vignette or maybe a shaped piece of coke can over the top part of the lens to change the throw into something more like a dipped car headlamp for when I'm on the road.
For £50 - I think it's great. But given my past experiences I'd still be reluctant to have any DX light as my only light when out in the wilds. Come to think of it I'd be nearly as reluctant with just one of any brand of light. I'll post an update when I've had it a week or so and will also take some beamshots comparing it to a P7 torch and a pair of Niterider Minewt X2's.