Bought this kingston xs2000 a while ago. It's officially rated for "up to" 2000Mb\s read\write but slows to a crawl after 30GB have been copied. Fyi, I'm copying files from an internal nvme (samsung 980 pro) via a usb 3.0 cable, so this kingston ssd is the only bottleneck.
To be fair, it's connected via a USB-A to USB-C cable. But that cable is rated for USB 3.0 speeds. The SSD was purchased from a reputable retailer in Germany, so I'm confident in it's authenticity.