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Quick anecdotal update: I created a Windows10 VM hosted on ZFS mirror (2 x 15K SAS drives) and ran my simple Python Fsync test: just the 2 x 15K SAS drives: 55 fsyncs / second (pretty good considering I was getting 33 on a laptop bare-metal Linux OS) With the 16G Optane SLOG on the ZFS mirror...

using a simple Python script, I measured 2545 fsyncs/s in my KINGSTON SA2000M81000G NVME and 9901 on the 16G Optane. So at least 4x fsync speed which is what ZIL needs. If you use them over Gbit network, 150MB/s is sufficient, if you need more, you can always stripe the ZIL and get 300MB/s...

The ones I bought (were from China via eBay). They were sold as brand new, were sealed and the Windows NVME utility reported nearly zero usage (what ever little usage could have been attributed to factory testing). I seriously think the issue is with the USB bridge and I attempt to confirm that...

I bought 4 of these with the intent of using them as USB (2.0) boot drives and as ZIL via PCIe adapters in an old Dell T610 server (only USB 2, and plenty of PCIe). Three of them died after trying to use them in some no-name RTL9210 based USB-A adapter. They checked out fine in the PCIE...