Unless you are making contact with a hot pipe there is no effective difference between the resistance to heat of the two products. I'm not sure about great stuff but I assume it's about the same as regular gun foam.
About vapor barriers. It's been beaten to death for decades now. There is an overwhelming body of empirical evidence showing that when cellulose is used a vapor barrier can actually be hazardous. There's no way to make it air tight so if you do have an overly moist house all of that water will seek out the seams and you will have a moisture problem in those spots. There are many reasons to avoid vapor barriers. I didn't think anyone actually used them any more. Maybe the people who install fiber glass in new construction use it.
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Chipping away on a daily basis.
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You know you're an ecorenovator if anything worth insulating is worth superinsulating.
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S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"
Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
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