This is too long to post much of a summary, but it is pretty negative. Worth the read before commenting.
http://semiaccurate.com/2017/03/19/intel-officially-introduces-xpoint-dc-p4800x-ssd/
"SemiAccurate has been down on Intel’s Xpoint memory and the official briefing changed very little of that. In fact it really only codified our earlier claims that the memory is so far from Intel’s initial claims that it might as well be a different product."