This is the older version. The new one is posted here WD Black 500GB NVMe PCIe M.2 SSD - WDS500G2X0CStill a good price in my opinion.
Capacity: 512GB*
Interface: PCI-Express Gen3 x4
Form Factor: M.2 2280
Sequential Read (Q=32, T=1): up to 2050MB/s**
Sequential Write (Q=32, T=1): up to 800MB/s**
Random Read 4KB IOPS (Q=32, T=4): 170K
Random Write 4KB IOPS (Q=32, T=4): 134K
PC Mark: 180K
Endurance (TBW): 160
Average Active Power: 135mW
Supply Voltage: 3.3V ± 5%
Peak Power: 2.5A
MTTF: 1.75M hours
Operating Temperature: 0°C to 70°C
Operating Vibration: 5.0gRMS, 10-2000Hz, 3 axes
Operating/Non Operating Shock: 1500G @0.5ms half sine
Dimension: 80mm x 22mm
I think this is the historical low for a PCIE NVME-based 512GB drive.
Mwave does sell a $179 ADATA XPG SX6000 drive with only 2 lanes as opposed to 4 lanes if anyone lives close enough to pick it up, but the WD Black is a good value drive at this price.
I've upgraded to the Black from a Crucial BX100 and actually saw an improvement in boot times, which is pretty awesome. It does run kinda hot though (71 degrees constantly)