Great Lakes ecoSmart
The ecoSmart series is an "eco-friendly" vinyl window that is touted as both an excellent performer and an environmentally friendly alternative to your standard vinyl window. I'm going to take the company at their word in terms of the environmentally friendly claim. In terms of performance, the window is quite good, but I wouldn't put it in the great category like I would for the Sunrise Restorations or the Okna EnviroStar.
The ecoSmart does have some very nice features and options, including a pinch fusion welded frame, a true sloped sill, high density foam fills (the company website claims that the R-factor of the ecoSmart is 7x greater than a non foam filled frame), a composite sill reinforcement, a vinyl exterior shield, an I-Core spacer system, two integral lock / tilt latch mechanisms, as well as a number of different glass options.
The ecoSmart is available as an awning, casement, slider, double hung, garden window, bow or bay, as well as a sliding patio door. One interesting note, you have to really search the website to discover that the windows are made by Great Lakes, I always find this interesting and wondering why they try to market the window as a standalone unit. All in all, the ecoSmart window is a decent performer with some nice features - I would certainly consider this vinyl window given the right price point and good installation. The Great Lakes EcoSmart Window Series gets a 4.4 out of 5 star rating.