The SSD Review published a review on the MyDigitalSSD OTG (On The Go) Pocket SuperSpeed USB 3.0 SSD (256GB) A quote from the article:

Two of the best things seen in recent external SSDS are the inclusion of SuperSpeed, along with the obvious massive reduction in size. Just yesterday we posted a report (http://thessdreview.us7.list-manage.com/track/click?u=3d9b6193ffd32dd60e84fc74b&id=01d78b95aa&e=1230c2ab07) of the EDGE diskGO SuperSpeed USB 3.0 flash drive where speeds of 449MB/s and 428MB/s were realized from a device the same size as a matchbox. Like the MyDigitalSSD OTG (On The Go) Pocket SSD we are reviewing today, the diskGO is UASP compliant with SuperSpeed, requires no external power other than the USB cable, and both qualify as being two of the smallest and fastest performing storage devices we have had in our hands yet.

 MyDigitalSSD OTG (On The Go) Pocket SuperSpeed USB 3.0 SSD Review (256GB) @ The SSD Review