Bests & Worsts Reviews from Amazon

Terrible product, at least as far as performing as claimed by the manufacturer. I will be requesting a full refund. I have a new HP Spectre X360 running Windows 10 Pro and a 512GB SSD, and have the SanDisk connected to the USB-C port. I am trying to copy a few GB of documents onto the SanDisk. Essentially all other apps are closed. I am getting in the range of 1-10 MB/s transfer rate. I got one or two instances where the rate hit almost 20 MB/s, but only briefly. Just peeked at see that I'm getting less than 10 KB/s (yes, that is KB, not MB). Highly disappointed.