Id like to hear about the problems associated to this.
We had gotten a handful of bids for every window in our house with the exception of the garage. When it came down to it, we went with Advanced as they had the best product for the price. The day of the install, I had to work. My mother came to watch the house while they installed. The installers showed up and were complete assholes to my mother because "Your son and daughter in law were supposed to take all the blinds down!" My mother calls me upset, I tell them to take their windows and shove them up their rear end, and to leave. The sales guy calls me and apologizes, tells me it was his fault he didn't tell us that we were expected to remove the blinds.
My mom, being the kind woman she is goes downstairs to take the blinds down on the 3 windows down there. Once again, the guys were ass hats, and said, "There aren't any windows for down there!"
Basically, their bid was the best because it didn't include all of the windows. I watched the guy measure each downstairs window, and we even discussed wether or not I wanted an exterior trim piece to cover the outer seams.
Of course, they offered me windows 'at cost' for the 3 downstairs after I called and blew a gasket. (If you know me, I am very even tempered and it takes a LOT to ruffle my feathers). I told them they needed to do them for free, not only for the installers being asses, but for their bogus bid.
I went with another company for the last 3 windows.
With the new windows and having about $300 of insulation blown into my attic and above my garage I saw an average of 28-34% lower heating and cooling costs.