Timeless is a nice performant skin that is less confusing than other modern skins.
It adapts extremely well with (extremely) wide and small screens, because it has a left and a right margin window, or switches to top sub-menus. Other page options are available from the top menu. User account options are gathered top right.
When used on a mobile device, the menus are replaced by icons.
Wide (ListeriaBot) tables do not render well.