> NO guarantees are given, NO sensitivity is quoted, NO response time is given.
True, but these have been on the market for many years and are marketed (by reputable companies) for the purpose of preventing CO poisoning in a domestic environment. If they were ineffective or misleading then they would have been withdrawn.
> I have been cooking in my vestibule for 20+ years.
I bet this guy has too, but this time something went wrong, with either his stove or lantern.
Given that these CO indicators are small, lightweight and inexpensive I think that they are worth consideration when using a stove or lantern in any confined space such as a hut, snow hole or tent.