How does this dropin compare to the new Surefire Fury DF?
I just purchased one before I read this.
Have to excuse my ignorance, does the new SF have the xhp35 HI in, presuming so. If the case, i am not sure SF would use close to 4000k in temp, so if you like a little warm edge to your neutral beam, you should be very happy. Output wise i would say similar, not sure if the reflector(looks to be) is a lot deeper than the p60 format. However this does produce and bright beam, more than substantial imo. Its not crazy intense, the hot spot does go quite broad at a little distance, but being a higher output option, there is some decent usable spill there as well. Its like a malkoff m61 on steroids, or HDS after growth hormones and steroids!
I have been using mine quite a bit over the holidays(happy holidays)

and do like it a lot. I will admit the 250lm or so of the 13% is enough around and outside house duties. As i am running the 16650 fuel, i am a little limited. It can hold 100% , but once my 4.35v cell gets near 4v(no scientific stuff here), it drops the output(no the step down). So when at 4v, i click on 100%, it runs for a few seconds then a noticeable step down which is brighter than 13% but of course less than 100%. This will be (it is a) none issue with higher drain cells and using 2x 18350 for example.
Its a pretty awesome drop in, cant comment on the cooler ones offered, but i will say the xhp35 HI are a clean beam in cool/neutral flavours. No offs in tints if that is a bug bear.
Hope enjoy michiganstud, used with an 18650 host with 8+ amp cells will bring this drop in to life.