Be sure to check out TweakTown's review of the Sabrent Rocket NVMe M.2 512GB SSD.
The 512GB model, in house, offers 3400 MB/s read and 2000 MB/s write going off marketing numbers with additional features such as advanced wear-leveling, bad block management, and over-provisioning, along with support for APST, ASPM, and L1.2 power management.