I recently bought a 2013 windsor knight, with aluminum frame, carbon forks, and some ultegra components. All the important specs look very solid. The one thing that I don't know about is the frame. All I know is that it's "double butted aluminum." I don't know how long it will last, how much it weighs and the quality of its construction.

Can someone help me understand frame quality?

windsor knight: http://bikesdirect.com/products/windsor/knight_x.htm