I had Best heating come to service my older model furnace through a deal I bought on Living Social. The service person although very friendly quickly turned my furnace service into a sales call. He had me sign off on some 'safety concerns' with my old furnace. This put me in a position where I had to replace my furnace to satisfy my home insurance.
Based on that sales pitch I did install a new furnace, with another company. FYI the other company told me after looking at my old furnace that it was safe and could likely be adjusted to correct for the 'safety concern' stated by the Best service person.