The ZenBook, from Asus, is a Windows 7 “ultrabook” hewing closely to the MacBook Air’s mold: an 11″ or 13″ display, teardrop shape, SSD as standard, and i5 or i7 processors from Intel. Previous challengers to Apple’s popular laptop (and subnotebooks of yore) suffered from uncompetitive prices; this one, however, matches it at $999 for the base model — albeit with a slower processor.