This company was terrible for me. I hired them to do two things:
1) - insulate the lower portion of an entrance stairwell.
2) - soundproof the upper portion of the same entrance stairwell.
They insulated okay, but it turns out they had no expertise in soundproofing - they used cheap/lighweight drywall, which, it turns out, is not permitted because it's a shared wall. Also, the soundproofing is worse than before they did anything. They told me they knew what they were doing, which was false. Don't believe me, believe the contractors I have had come and review the work. They all say I got ripped off.
Long story short - I have to get their work completely redone.