Jeremy, We had Masssave done a few years ago. Their subcontractor was excellent for airsealing and insulation. A nice group of guys, very professional and cleaned up well. They must be putting in quite a bit of insulation for that price. It is well worth it. Their air seal guy found all sorts of penetrations that I was not aware of. They sealed every pipe and wire penetration going up through the floors. Just the air sealing alone was an eye opener and worth it. I think you will find their subcontractor good, as this program is a huge account for them, and they do not want any bad customer experiences to lose that account. I need to remove my existing can lights in my kitchen. The were pulling a bit of air up through the fixtures and into the framing.