This is the exact same 1TB NVMe that's being used in the GPD Win Max 2 or GPD Win 4 by GPD.
It's reasonably fast and used 3D TLC Flash memory.
You can find a proper benchmark on this website.
These SSDs are almost brand new. Why almost?
Well, GPD doesn't officially sell the GPD Win Max 2 with 2TB anymore, so we're buying 1TB units and replace them with 2TB SSDs.
These BiWin NVMes are the ones taken from these units and we just cleared the installed OS. Except for that, they have not been used.
This is also the reason we're selling them for a pretty good price :)