I don't have specific experience with Renewal by Andersen windows, but I recently did a lot of research into replacing my windows in my entire house. I started off dead set on Andersen windows until I started getting the prices back on what it would cost to do my windows.
It was very important to preserve the look of our double hung windows with had 6 lites on the top and the bottom open. We also like the look of the grills on the outside of the glass (not in between the glass like most people get nowadays). We also wanted to replicate the nickel tone of our original wood window locks and hardware.
Windows of the Future Today - OKNA Windows & Doors
Okna windows is the window we went with. They also have composite windows (the same or similar material to Andersen windows) under the Starmark name.
We did some research and found numerous posts about the quality of the windows. Their energy efficiency numbers were excellent compared to Andersen's. We personally went with the Enviro-Star 800 series and got all the features we wanted (Simulated Divided Light, Nickel finish hardware and all white). They match the original windows (actually we left two of the original windows between our kitchen and sunroom - They look nearly identical). The best part was the price. We did 21 windows (17 Double hung and 4 basement sliders) and 1 dead light to insulate a stain glass window in the front for a total of around $11,500 installed.
This is our first winter with the new windows and the difference is major. No drafts or noise (even during the major blizzard we received earlier this month the windows didnt rattle and shake. We hardly know when the window is blowing). The look is beautiful and we are happy with the quality of the install. If you do some research you will find many positive reviews.
If we were going to go Andersen we were going to do the Woodwright 400 series which also comes as a replacement window, but the price was literally double of the Okna windows. We were also concerned about the maintenance of the wood windows and having to have paint them white. If we were going to keep the wood look of the windows (not white) we probably would have went in this direction. Since you are already considering a composite then do yourself a favor and do a bit more research. You will find their may be better options then Renewal by Andersen out there.