I built a rather intense system (32 core, 256GB Ram, 6xLSI, 48xSamsung 830) last year. Before I finally chose components I tested 12 different SSDs, among them the V4. For my type of workload, the drop in write performance depending on fill factor made it almost impossible to create a predictable environment. Sometimes, mostly for the usual benchmarks, performance was superb, but with longer write activities it was the slowest drive.

when you choose to go with the V4's make sure the drives have identical write history. Be aware of the perf drop when crossing the 50% free mark.

regards,
Andy