Specialty insulation did fantastic job of replacing the insulation on our 1978 house. We had a full replacement of our attic insulation, basement insulation, sealing of ducts and new duct insulation, and a new vapor barrier for the crawl space. Im not sure how they managed to do it all but in two days but they did and it looks amazing (1970 ft^2 house) . These guys are well worth it.
Specialty Insulation was quick professional and reasonably priced. They insulated our attic just before the current heat wave and we are now cool and happy.