WD makes no effort to explain why we should pay more for Ultra. Is it faster? WHAT is the difference? You would think they’d put that in product descriptions, especially when you choose two products for comparison.
From the main product page:
Brilliant Design
The My Passport™ Ultra drive fuses metallic and matte finishes to create a sophisticated style. This brilliant design fits comfortably in the palm of your hand, pocket or purse so you can easily carry the content you love anywhere you go.
That’s pretty much it in a nutshell. 
