As part of an Energy Audit Retrofit we had Sears install four (out of a total of 10) Renaissance Windows. The sales associate from Sears was very helpful in recommending styles and the best options for our house (i.e. going with a retrofit or a full ripout) and seemed knowledgeable about his and other products. We found the price to be a bit high but the Sears' equal billing financing option helped balance out the equation.
The installers did an acceptable job with the installation but we did encounter some issues. In one case, the foam expanded out of the frame and through the outside caulking. I ended up cleaning that up. The other issue was with the interior side of the same window where the installer didn't remove a bracket and caulked around it and also didn't caulk down one side of the window. Another thing for me to address. At a later time when we pointed this out to the sales associate (when were looking to get additional windows) he indicated that he could fix the issue but he never followed up. With that said, I am mostly satisifed with the Sears product and installation and our Eco Audit did not reveal any significant issues although I did notice they seem to leak a bit more from the window drain (when compared to the other installation).
We chose not to go with the additional five windows and a patio door because the second Sears quote was approximately 35% more than another quote for a product that was equal or better in quality. Based on my experience with the first set of windows I didn't see a good reason to justify that premium.