No trouble at all with mine. I have blown mineral wool. At the time I got it the Electricity company had a big contract and I felt pretty sure they would not go bust or run off with my money, and it might have been subsidised. See if your gas or electric company, or local council, have a scheme.
The contractors can now be forced to remove it at their own expense if they put it in an inappropriate building, so they they are much more careful to look for defective walls that may be damp, or cavities that have builders rubble in them, and refuse to quote. Some parts of the country with persistent driving rain are also considered unsuitable.
In my case, the house was more comfortable, , heating costs went down, and, because the walls were warmer, misting and condensation on bathroom tiles stopped.
You seldom see such reports in the papers, because dissatisfied customers are much more newsworthy.