And if so, how's the performance you've observed compared to SSD?
I admin a couple sites which use NVMe SSDs. With older enterprise SLC NAND. It is a noticeable and significant improvement going from SATA/SAS SSD to NVMe SSDs. Especially when creating & restoring MySQL databases. It essentially "solves" MySQL IO, with a single mysql server a XenForo 2.1.x forum was easily handling >20000 users online (in ~15 minutes) mostly hitting the one thread. This is with without guest caching or aggressive cloudflare caching. If you are getting IO bottlenecks it is something is being very dumb query wise.