Lenovos Yoga series has a lot of fans — and we just mean within the PC-making fraternity. ASUS might have initially bested the Yoga with its dual-screened convertible laptop, but two screens meant weaker battery life and well, it was expensive too. The Transformer Book Flip, then, also offers four different use cases: completely flat like a tablet, a house of cards style prop-up structure, a media-viewing mode with the keyboard down, and good-ole laptop mode.