A lot of people are reporting the drives are "30-50% slower" but I dispute this finding. The E12S has the same specs as the E12, the NAND is the same or superior (96L), but there is less DRAM (which would only impact heavy workloads/benchmarks). I suspect there might be a change in the SLC cache design that might result in poor sequential performance in benchmarks but I have no evidence/proof of this yet. As an example, compare the SN750 to the SX8200 Pro: the SN750's small, static SLC cache runs out rapidly and drops to 1500 MB/s almost immediately while the SX8200 Pro's large, dynamic SLC cache remains twice as fast for quite a while. This does not mean the SN750 is inferior whatsoever, just a design decision, so my theory so far is that the new drives might forego SLC for some reason. Still investigating.