We research pretty much everything before we buy it, and our home replacement windows were no exception. The information that we gathered on the Presidential Series Vinyl windows from NT sounded perfect, and the pricing for this high-end model was much better than certain name brands with very similar efficiency factors. Delivery was very quick and the installation was a breeze. The window, themselves are beautiful and complement our home. We found immediate savings from our electric bill and sounds from the outside are almost non-existent. My wife is just ecstatic, especially for our large picture window in the living room and the beautiful casement window we put over the sink that tilts out from the bottom. The double hung units, elsewhere are so nice and allow us to open them from the bottom or from the top. We could not be more satisfied!!