Here you pay with the aluminum case and since everyone has to decide whether it is his own value, but spend more money itself.
Another advantage is that the silver aluminum has only been installed on the top. For if you do not ever be afraid to scratched the beautiful drive. This is for example in the WD Air hard drive is the case where the complete outline consists of silver aluminum and it has quickly turned these quirks.
The drive is very fast ... at least is not my other USB3 disks faster. But visually renders the WD Slim with its aluminum cover simply head turner. And not just for the eye but also combines super on. Also is very stable .... not creak or bend possible, eg. In the WD Ultra
It fits perfectly to Apple products like my iMac or Macbook Pro Retina .... you'd think it would be a hard disk manufactured by Apple. She also is very shallow for 1TB. When Imac it would not matter to me yet but just the Macbook Pro Retina fits any high hard disk for thin laptop.
However, the price at Amazon extremely varies (ie directly through Amazon). When I ordered the hard drive, it has cost "only" 84. Meanwhile, it fluctuates always 89-120. I'm willing to pay a premium for the aluminum case but certainly not more than 50 as compared to a comparable down to the external WD My Passport Ultra.
Oh .... also is still a small bag there. It consists only of thin fabric and but only protects against scratches other manufacturers put not even something with.
The supplied backup programs I have not tested this since I only use Apple's Time Machine.
In short .... I am excited about the hard drive and it can only recommend.