Great Lakes Lifestyles Ratings
If you look at the National Fenestration Ratings Council website, the Great Lakes Lifestyles window is lumped in with the Bayshore and Seabrooke (not completely sure why this would be, presumably these window models are going to vary somewhat in terms of performance.) With the standard low-e glass option, the window will get a .34 U factor, .24 SHGC, .34 VT, and a 51 condensation resistance. All in all, not very impressive.
If you upgrade to the plus glass package, you can expect a .29 U-factor, .24 SHGC, .40 VT, and a 54 condensation resistance rating. As with the Seabrooke model, I couldn't find any AI or air infiltration data on the Great Lakes Lifestyles window.