Not really sure how this is effective or where they even get those numbers, as 625 MB/s is wrong too, sustained transfer rates would top out at 512 MB/s with no other devices on the bus. This is also ignoring the fact that USB is a horrible way to implement whatever this is with all of the cpu overhead required to run the USB device in the first place. This thing claims to be a ramdisk using system ram....from a usb port really confusing.
The only thing I can see this actually speeding up would be transferring a massive number of small files. On USB 3.0 I always notice write speeds dropping massively when writing a cluster of smaller files. If it can create an image on RAM and then transfer them all in bulk, much like a .zip file, then you would at lest get full write speed out of it for the entirety of the transfer.
USB drives are for quick transferring and removing, if this uses RAM as a fake high speed transfer while its not actually transferred to the device it is USELESS
Theres an easy way to mimic this on ANY device - device manager change the profile to high performance rather then quick removal - Windows will then use the ram like this device suggests it will do to "boost" transfer speeds
This is infact all BS because the devices can only read/write at a specific rate, and will always take just as long no matter what you do
The problem is customers/end users will just remove the device mid way through transfers thinking there done and corrupt the files or leave things incomplete (aka its not idiot proof)
Other problems - these devices are usually used by "limited" users - most computers there transferring it to/from will have the OS secured/limited (schools university workplaces etc) so your unable to install applications/drivers to allow the speeds/device in the first place (why otherwise would you own a external storage device)
Nice form factor,and it is really good that it is mobile, but the general idea is so old that I'm surprised it's not standard on all motherboards to have fast memory directly on the motherboard pcb dedicated to this type of task by now.