WD_BLACK™ AN1500 NVMe™ PCIe SSD Add-in-Card | Western Digital
Experience lightning fast gameplay with this bootable, plug and play add-in-card that reaches extreme velocity with minimum effort. Includes customizable RGB lighting and heatsink.
shop.westerndigital.com
I bought this drive to try out, it's certainly a compelling form factor for the MP. It's basically a RAID 0 setup with an 8x PCIE 3 interface.
For starters it works without issue in MacOS, which is obviously a plus! My current setup is 2X 2TB 970 EVO Plus in software RAID 0. It's easy to compare these two because they're so similar. Here are some results:
WD AN1500
2x 970 EVO Plus RAID 0
So as you can see reads are extremely fast and consistent on the AN1500, but writes are significantly worse than the 970 EVO Plus setup. There is definitely a tradeoff with this SSD. Anyway hope this helps someone!