Ok. I finally managed to run it and are my few cents:
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Specular GI, is extremly slow, it add 15ms, to SunTemple scene. I won’t consider it as issues as long as metalic surfaces, will be able to work with build in reflections.
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Diffuse GI is fast. With diffuse GI only it runs at 15ms, which I guess pretty acceptable (;.
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It looks good. Though, it’s to notice any indirect shadowing on SunTemple map.
I really like it overall. Going to test on landscape map.
Edit:
What I noticed though, that on SunTemple when you get to fist closed room, and look directly at windows, on left side, GI just stop working. Zero indirect lighting.
What really impresses me most, is that method despite only one bounce, can be easily used light entire scene, without using sky light.