The sample scene that you guys are looking at in this thread is not enclosed - while you can get results you like, it still has the syndrome of having almost all light after the first or second bounce disappear into nowhere.  Since the render options are only set to 4 bounces anyway, this isn't a really big deal.  This isn't what I would consider a good "general purpose" GI setup but I'm sure BB is already aware of this.  A whole lot of people are not though, and I think it's something folks should keep in mind.

A good example of the down side to this kind of setup is the M4 renders - note the top of his head is almost completely black.  This is because there's no ceiling to bounce light down onto his head from above, there's just infinite black emptiness.  Fine if you're aware of this and you want this effect, but let it be your choice rather than just not knowing how it should be.

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