Dual-OS devices have been in the works for a minute, though Asus hit the finish line first with its Android 4.1 and Windows 8.1-operated convertible. The Transformer Book Duet runs Google’s operating system and can switch over to Microsoft’s popular software when docked with a keyboard, though you can switch systems at the touch of a button. Other goods include a speedy Intel Core i3 or i7 processor with 1366x768, 1080p display, 128GB SSD, and up to a 1TB hard drive.