Just a point of clarification...
One triple is an XP-G
while the other is an XP-E
The XM-L actually didn't exist at the time I was finalizing the design. The XM-L triple is coming, however, in the same way that the XP-G creates a wider beam than the XP-E for the same optics, this will happen again for the XM-L. So the improvement over the XP-G may be minimal with the 20mm triple optics. I agree that the larger single optics and reflectors are a better way to go for the XM-L. One of the design aspects was to be able to actually use the light that escapes out the side of the optics, so the triples fit the bill nicely for that.
Full disclosure - I'm the "guy in the garage" designer of these lights. My intent for posting was just to clarify some details and answer some questions.
that makes sense - I've read of other builders mixing XP-E and XP-G, either as 2 triples or in a 7-up, to get a good mix of flood vs. throw. As for the XM-L, I agree, it's easy to forget the time lag between design and production, plus all the effort that goes into sorting out optics. I can't off the top of my head remember what depth 20mm triple optics are, but if these are 20mm triples, then a 20mm XM-L star + LXP-RS optic should drop in easily and would provide an awesome beam pattern (I have a dual XM-L light with a Laura RS (square LXP-RS) and CXP-RS and the beam is amazing). THe housing looks like it should be able to dissipate 2x
[email protected] and the Lflex from Taskled would work perfectly with a twin LED setup and the 2S Magic Shine batteries you existing lights work with. Oh, and if you're thinking triple XM-L, the 35mm Cute SS optics are supposed to be awesome, though that might need a rethink of the housing (3 XM-L U2 @3A = ~3000lm theoretical though

)
None of that is meant as criticism of your current lights, I think they look awesome and great value (the batteries especially so), just some ideas for future versions.
Azra - I can see how the rear light would help in city environments, I'd just be careful of roadrage that's all!