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.
Don't buy SSDs with no DRAM cache. Caching is half the battle when it comes to high speed transferring of data. If you need to transfer data frequently then you'll want to spend a little more on an SSD with DRAM instead of SLC cache. There are lots of resources online with which devices use which kinds of cache.
It's very frustrating how you have to do research to see if it has dram.
Even using PCPP you have to go to every product page and try to find a review, etc.
It should be a top level specification, or name, etc.