Summary: I have been using this for a while on my Macbook Pro early 2011. This has given my Macbook Pro usb 3.0 capability. I use AJA system test to test the speed, its a free software. Write is 37.4 MB/s and Read is 40.5 MB/s on a 5400 rpm hard drive.
Summary: This works very well, with very little effort to change out the cable interface. Just wish that I could find out how to procure the SATA cable so I could use it on SATA. I haven't been able to find that particular upgrade for it on the web.
Summary: It took me a whole night to backup my files to the hard drive on the 2.0 standard while the 3.0 changed that to about half the time or maybe even less and putting them back on my computer was even quicker.
Summary: This upgrade cable kit rocks!! I'm a mobile DJ and I move a lot of music around from hard drive to hard drive, and this makes that go a lot faster than it used to. It's really simple to use. Basically plug and play.
Summary: I use this adapter with my Dell laptop connecting to the 1TB GoFlex hard drive & i dont see a significant improvement in transfer speed using this adapter or regulate laptop usb. the difference is only 10-15% which is not too significant for my backup job. Not your money's worth!