The reign undisputed MacBook Air on the field thin and light winds down – the Ultrabooks are coming and U300 Lenovo seems to be one of the strongest competitors we have yet seen. This is a new entry to the IdeaPad line, thinner and lighter in a series U redesigned and reborn, which also include some chunky 13.3-inch U300 and the even larger, but more serious 14-inch U400. All three are shipping in October, and we recently had the chance to try the tiny trio. Read on for more details and our full impressions.