We had this company come to give and quote and subsequently install insulation for our house as well as some roof vents. Luke was always very polite and gave great information at his quote.
Work seemed a little bit slow, doing short days instead of long days, however - I can not comment on the conditions of having to work in someone's roof space when warm!
They always cleaned up after themselves and I felt comfortable leaving them in our home when we were not there.
There was some very minor damage that was caused inadvertently from the works and Luke was very apologetic and more than willing to (and did) rectify very quickly.

Approximate cost: $Varies