I am very happy with the Gecko panes. They work well, and have noticed that they make rooms warmer. Condensation on the windows is a thing of the past. It would have been a very big and expensive job to put any other form of secondary glazing on our windows, and this was pretty simple and quick. I tried a single pane first to see how it would look – a sort of try before you commit – and promptly ordered enough panes for four large sash windows. There is a knack to fitting them, but quickly got this after a couple of panes.