18.5mm Smooth Aluminum Reflector

Pros: Well made. Clear spot with no extra line.
Solid aluminium does not melt when overheated while testing. Actually it can conduct heat away from led. All measures are same with other reflector, so building several lights with one model can be done

Cons: Causes shortcircuit if used without insulating material between led and reflector. But thats not really cons, more an feature

Other: Works perfectly with Cree Q5 and because of threads it can replace old reflector by just drilling and making new threads

Pros: Nice threaded body, still easy to filed it down a bit to fit your project.

Cons: Bought two of them one was absolutely perfect but second one had a small problem with reflective surface. Still used them both cos problem was almost unnoticeable. My advice buy two or three, you get a spare for your projects.

Other: When you use them for XP-G and XM-L you can "regulate" size of the spill by putting emitter deeper for more throw. I guess you can use this ref for P7 and MC-E emitters

Pros: I used this reflector to mod my A10B which came with an OP reflector. This reflector focused the R2 better than the identical OP reflector and made for a very handy light. Plenty of Throw with an R2 just the right amount of flood.

Cons: The threads prevent this reflector from being used in some of my other lights that fit this size reflector, it's not a big deal because some mild sanding are a little dremel work would allow them to clear the threads but it's a mentionable inconvienience.

Other: This reflector was better than the OP reflector, it wasn't a night and day difference but it's noticable.
This reflector is perfect for XRE LED's like the R2 or Q5, I tried using it with an XML and decided there exists too much flood. With an XML it's not so floody that it's not bright mind you, it focuses it enough to be a very useful floodlight, I am just not that into floody lights.