Intel P5800X user, checking in. The latency improvement when I switched from a Samsung 990 to the P5800X wasn't quite as mind-blowing or revelatory as the HDD to (SATA) SSD switch was ~16 years ago (OCZ Vertex LE -- $300 for 100 GB!) but compared to standard nvme it still feels like a dramatic improvement. It's startling to realize how much performance we're leaving on the table even with nvme ssds. Build times for what I work on dropped by much more than 50%, if I remember correctly, when I switched and everything on my system feels more responsive.

Edit: optane also shows what the SSD/nvme sequential-throughput marketing wars have cost us. Latency and random 4k iops always should have been the focus (in research, development, reviews, and benchmarks), not sequential throughput.

There's rumors floating around that Chinese firms will soon be bringing new PCM storage solutions to the datacenter market. Not nearly as good as 3dXPoint/Optane, but should nonetheless be lower latency than Flash and much better endurance (DWPD).

If the pricing is competitive it will easily be replacing DRAM for many lower-level uses, thanks to its support for better PCIe standards (5.0 at least, while aftermarket Optane is stuck on 4.0).