For what it's worth, I have a Honda 2000, supposedly the quietest generator. It is pretty good, but it is far from silent. Any decibel reduction is a win, as far as I am concerned.
We have gone several years without ever having to run the generator while camping -- I run it once a month at home to keep the carb clean, and we have solar. But there will come a time when we will need the generator for real, and I want to minimize its impact on me and on my neighbors, if any. (We usually boondock, far from other folks.)
I think that the heat buildup under a sound blanket would be a real problem.
