We had insulation put in our roof. We did have a few issues ; for example, not enough insulation was put in and we ended up with some cold drafts. Our house felt colder than before the insulation was added. A extremely competent and very nice man called Sammie came to our house and fixed things. He added 4 more inches of insulation that was missing and that we had already paid for. He also insulated an area, that should of been insulated by GNI, that has corrected the cold draft problem. Pros: they corrected their mistakes.
Cons: the mistakes should never had been made in the first place. Always check any companies work to see if you get the insulation you paid for.