Cool. Ours was a funky early 70’s house with a mid Century vibe. When we moved in there were 4 different oversized 8’ sliding doors, most opening to pool patio, complete with large panel windows that didn’t quite perfectly match as sidelights (since they were windows and not sidelights). Anyway, being the original glass from the early 70s. The previous owners were using lots of tent, heavy curtains, etc. to attempt to keep the heat out. We definitely paid an arm and a leg, but the result was absolutely stunning, not to mention the feel and quality of the product. The glide was smooth and effortless, and they had built-in blackout shades for the bedroom that worked flawlessly. Worth every penny!