As to the price issue. Doing a bit of cursory price checking on Amazon, it looks like a decent SSD will cost around $0.35/GB, and HDD around $0.035. That's 10x the price for technology that's nearly half as old. Now compare the first commercially available 3D XPoint memory to current ssd. Right out of the gate, it's about $2.40/GB, just under 7x the price of 28 year-old technology. Not too shabby by comparison. Now we'll have to see if price/performance tradeoff is as reasonable as flash v. hdd.