Here's that rig set up with the 100L:
Neuro, great seeing your portable setup (and very nice portrait of the mantis!). A few questions:
1) Do you see any benefits of using the omni-bounce on the MT-24EX? I think it's there in your setup, but I wonder about its effectiveness taking into account the suggested use of the omni-bounce versus the nature of macro lighting.
2) I really like the idea of the extension bracket for background light. Have you experienced any problems with line-of-sight contact getting the flash to fire?
3) I've been tempted by the MP-E 65mm for a while. Do you use the use Canon's hood on it? If so, what's your experience, particularly if attaching the MT-24 EX directly to the lens with the ring adapter?