How does the Cintiq Companion compare especially to a Cintiq 13HD creative pen display?

The Cintiq Companion is like a Cintiq 13HD with multi-touch but with computing power and operating system (Windows 8) when disconnected from a PC or Mac. It can be used in two ways:

1. Connected to a PC or Mac with Cintiq Connect technology, it offers the same functionality as a Cintiq 13HD creative pen display plus multi-touch
2. Disconnected from a PC or Mac, it runs stand-alone as a powerful PC with Windows 8.1 and full Intel® Core™ computing power.