I have three tri leds I've tried these on so far.
I don't have data at this point, just anecdotes:
1. These fit tri-cree less than perfectly. Yes they can be made to fit, ( and it appears that even fitting imperfectly the ends of long blades are more evenly lit, but I can't determine if they are absolutely brighter than the ends of conventional 18 degree optics that fit better.)
2. They seem to color mix differently. On a r-o/lime/lime rebel, the 9 degree seemed better in end to end light evenness, brightness and mixing than the 18. On a rb/rb/red... I can't make up my mind, it can look weird sometimes.
3. I cannot comment on compatibility with most other parts, I make my heat sinks on a lathe, and drill out schedule 80 pipe for blade holders, so I can just make things fit as needed.