CrystalDiskMark is a synthetic benchmark that tests both sequential and random small and mid-sized file transfers. It provides a quick look at best and worst case scenarios with regard to SSD performance, best case being larger sequential transfers and worse case being small, random transfers.
We had some interesting behavior with CrystalDiskMark when testing the OCZ Agility 3 and Corsair Force 3 series drives. As you can see, those two drives, which both happen to use Micron NAND, perform much lower than the rest of the pack in the sequential transfer tests. This is due to the incompressible nature of the data used in the tests and the NAND flash configuration of the drives. The other drives perform much closer to their rated specifications, and once again, the OCZ Vertex 3 MaxIOPS edition puts of the highest scores overall.