Grabbed this in XHP70.3 Hi 4000k (high CRI) and am very impressed. I was after an efficient boost-driven light for outdoor hikes and this is an almost perfect fit.
Fit & finish is very good, the optics / glass are clean, and the beam is a great general-purpose mix of flood and throw.
No hint of green from my sample of the XHP70.3, though I do think the 5000k version might have been a better choice - the warm light is nice but can make clean white / grey objects appear a bit off-colour.
The reflector works well with this emitter, and there's no obvious tint shift.
The springs aren't quite long enough for 18650s to work (it's a 21700 light after all), but a small 5mm magnet will fix that.
The only area for improvement would be to increase the maximum drive current - 4A is well below what an XHP70.3 can handle, and it would be nice to have the option of driving it harder on turbo. The light's plenty bright as-is, but it leaves a little bit of output untapped.
Got this in SFN60 6500K and the output is amazing. The beam is satisfyingly round and delivers a lumen output that seems to rival much stronger flashlights. Personally I quite like the color temp too. For such quality and output at this price point, I can highly recommend the D1 or D1K in SFN60 for an excellent wall of light.