Advantage - that new design is from the surface "valent" and grippy.
Disadvantage (s):
The Activity LED is no longer on the front page, but on the top of the housing (which for the HDD means that it is operated on the head lying, you will see the LED on the top. It is also much smaller and is under a tiny hole of the housing.
The USB 3 connector on the housing is lower, at first I thought that the old cable no longer fits its predecessor - it's just less precisely.
The old cap will not fit on the new housing (not really bad ....)
But: The previously existing metallic base is now made of plastic :-(