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@bombcup
Well it's been discussed on some of the coffee forums, I think the consensus is that some sort of silicon mat is the best thing. I don't know how much heat the fibreglass saves, the cups on top still get warm (my machine doesn't have a cup warming loop) but it's definitely better than nothing and it's cheap.
I guess the scientific way to tell would be to measure the time between the pressurestat clicking off and on again while the machine is idling, before and after installing the insulation.