If you have a Seagate GoFlex portable hard drive and you want it to transfer data faster (instead of buying a new USB 3.0 drive) Then this is pretty much your only option.
It it slightly different from the USB 2.0 cable option in that the Hard drive connector and USB cable are connected and not removable. As a result, it makes the drive less streamlined as you have a cable sticking out the end. The cable itself is slightly thicker (5mm thick) so it's not as flexible and is about 45cm long. It also has a soft white indicator led to show the drive is working. Transfer speeds are fast (about 6 times faster) due to the fact that the hard drive isnt capable of transferring any faster. On average, i achieved a transfer speed of 75MB/s which made transfering large files like videos much more bearable.
I mentioned it lacked a "sturdy feel" because the hard drive connector sits with a 1mm gap between the hard drive and connector. This allows it to flex up and down a bit which is slightly disconcerting seeing as the USB 2.0 connector which was supplied with my 500GB HDD, doesn't have this (superficial?) problem... Regardless, the connector has yet to fail or fall out unintentionally.
In conclusion, while i can criticise the minor deficiencies in design and manufacturing, the product works and has yet to fail. Regardless of this, if you have a Seagate GoFlex HDD, it's your only available option to upgrade speed. Furthermore, Seagate's modular system remains one of the cheapest ways to get fast data transfer across a portable hard drive. Thus, if you are looking to get a fast (USB 3.0) hard drive, get this and a Seagate GoFlex HDD.