This is a real late reply, both for future references ...

We ordered 22 or so double hung and sliders (with art glass - very nice btw) and are very happy with them.

We are in our second year and I can see a tremendous bit savings in our heating and ac bills. The windows are triple pane, easy to operate, sound proof, and well built.

I was out shopping for an entry door today and saw some Andersons and Marvin windows in the store and the quality difference was night and day.

We replaced 3 sets of windows that were comprised of 3 double hungs each. We were originally going to change them to 3 bay windows but instead changed all three to one window with 2 sliders and a fixed window in the center. The fixed window is clear/no grids and about 50% in total width. The outer two sliders are 25% in width with special art glass and metal grids.

This new configuration increased the amount of glass while reducing the white vinyl frame.

We also saved a lot of money by adding the art glass to the two sliders instead of the two double hungs. Art glass is charged as each single insert so a double hung needs two pieces and a slider needs only one.