We used it in the office attic. I was off the day the 'professional' attic insulators installed it, so needless to say they botched the job. They were paid on the day... Did not tape the joins, gaps large enough to stick you arm through etc, etc. The attic is used for a storage, it did stop the attic from freezing, but over all did not make much difference to the heating bill.
Conclusion: Install not done properly but even still, better than nothing!