After the first night with my ZL SC600 MkII L2 (what a mouthful), I still have nothing but positive things to say. Most of us already know that the ZL has one of the most versatile UI's out there. What I think is difficult to impart upon people is just how small this 18650 cell, 1100 lumen light is.
Here it is with some well-known AA and CR123 EDC lights:

Nitecore Smart PD D10 - 1xAA/14500 - 130 lumens
Zebralight SC600 II L2 - 1x18650 -
1100 lumens
HDS Systems EDC170 Tactical - 1xCR123/16340 170 lumens
Surefire L1 Lumamax (Gen 6) - 1xCR123/16340 230 lumens
And here we have it with a couple of my most-used 18650 lights. It's hard to believe that all three of these lights use the same cell. Granted, the Quark and Peak are fairly large 18650 lights.

Quark Tactical XP-E neutral w/18650 body - 200 lumens
Peak First Responder (3xSeoul P4) - 400 lumens
Prior to receiving the SC600 MkII L2, the Fenix TK30 (2x18650, MC-E emitter) was the brightest light I owned @ 630 lumens. The TK30 out-throws the Zebralight by a good margin and runtimes are impressive, but the Zebralight clearly has more overall output.

In summary, it is a fantastic light. It's well built and finished, small enough to EDC in a jacket or even cargo pants/shorts and has incredible output with great efficiency/runtime. The beam is perfect for the majority of my uses and I prefer a floody beam in a carry light. The UI is great, and only bested by the HDS. The HDS is simpler to operate while still offering more customization. However, the HDS also costs twice as much...