They come out and push their own window. Their competitiors and write-ups in consumer magazines warn homeowners to stay away from home-made brands and to use national brands that are tested and proven.
The rep that they sent out was nice though.
I went with another local dealer that sold a quality brand that I could trust.
We used Brothers when we replaced our windows and patio door. They are not the cheapest by far but they are pretty efficient. They have lifetime guarantees on their windows. The only complaint I had was that there is a long waiting period between the time that you commit to have them install the windows and the time that they come to install them. I think we waited a month.
CONS: Long waiting period