AS SSD is a great free tool designed just for benching Solid State Drives. It performs an array of sequential read and write tests, as well as random read and write tests with sequential access times over a portion of the drive. AS SSD includes a sub suite of benchmarks with various file pattern algorithms but this is difficult in trying to judge accurate performance figures.
The WD Blue SN570 doesn't fare that well in the demanding AS SSD benchmark but it does perform better than the previous WD Blue SN550 for both reads and writes.