I received one recently from Fasttech and the LED was not attached to the heatsink properly. After removing the LED, what I saw was CONCERNING. 
Sorry for the crappy picture.
The small circle/hole in the middle I assume is from the lathe but is a sign of bad machiening. Even my lower quality N-light HB-50 did NOT have this tool mark. Besides the hole, what was worse was that the surface did NOT feel FLAT. It in fact felt slightly dome shaped and I assume this is why the LED did not remain in place. (Thermal paste was used and not thermal epoxy). I tried removing the driver to get free access to the surface to some how flatten it but, could not get the driver out (and broke a 7135 chip in the process) so had to ratch something with the dremel. The work is horrible (because I didn’t want to damage the output wires) but it’s sufficiently flat now.
Ok. thruhfully, I was feeling a little manic after too much coffee and didn’t have any patience at all. 
Have anyone here remove the LED star from any of their Roche F12s (specify where you bought it please) and seen what’s underneath?
The first Roche I bought was from int-outdoor and there are some differences between these two. 1) intl-outdoor : ‘O’ ring around bezel, fasttech: No ’O’ring. 2) intl-outdoor: Plain window, fasttech: AR coated window. 3) Switches feel different 4) Different lanyards.
Thanks for your inputs.
