CrystalDiskMark is a synthetic benchmark that tests both sequential and random small and mid-sized file transfers using incompressible data. 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.
The Plextor M6e Black Edition performed well across the board in the CrystalDiskMark tests, though its middling performance with small transfers at low queue depths shows again here.
Here's a look at what the drive can do in this benchmark when PlextTurbo is enabled. Of course, those numbers are more indicative of how the software caches data to system memory, but with a workload like this one, the kind of performance gains that are technically possible are revealed.