Valleyforge, it's totally OK for you to mistrust OCZ until proven otherwise, and it's totally OK for you not to buy and recommend their products. But claiming this SSD would be a terrible product just because it's from OCZ is not OK - unguilty until proven otherwise. BTW: the controller and basic firmware of this drive have been in service for quite some time in other product(s?) now, so it's not something completely new and unknown.
CrazyElf, I'd say that OCZ failures were even more severe with Sandforce 1 rather than 2. But that doesn't matter any more. And regarding your outlook: I see no reason why "budget" drives wouldn't transition over to M.2 as well, once the controller and mainboards are established. They may not need it for write performance, but reads could certainly make use of the additional bandwidth. They even save money on the PCB and case (none for M.2).
Regarding QLC: there would be dimishing gains (at best 33% more capacity than TLC, in practice less than that) at amplified cost (16 states to distinguish instead of 8 for TLC). If it's even going to happen it probably needs 3D-NAND and would be used in SD cards etc. at first. We might see phase change memory (PCM) take over before this becomes reality... it's been promised since a few yeras, but recently Hitachi actually showed a very high performing prototype. Forget about that nonsense of PCM replacing DRAM, but replacing NAND is something it could do very well.
Oh and what the ARC offers over MX100 and Evo? If it's not price I still consider the exceptionally high write performance at 128 GB as an outstanding feature.