As mentioned earlier, I had planned on purchasing several 500GB EVO 960s for various computers I own. I really didn't need that much storage on an OS drive, but (as noted) Samsung deleted the 256GB capacity in the 960 Pro series and I wanted an endurance rating of more than the 100 TBW of the 250GB EVO 960.
Hence, with a TBW rating of 200, the 500GB EVO 960 seemed like the next best option.
However, the 250GB EVO 960 got such a poor review, and other posts here (Rhysiam/Chris) seemed to suggest that the (yet to be released) 500GB EVO 960 might not fare much better in performance, I decided to wait on Chris' review rather than pre-order the 500GB 960s.
Moreover, even if the 500GB version proves to perform somewhat better than the 250GB version, there is still the poor notebook battery performance with which to contend.
Meanwhile, for Black Friday, Newegg is running the tried-and-proven Samsung 256GB 950 Pro for $169.99. So I bought another one of those. At the sale price it's only $40 more than the 250GB 960 EVO -- but it performs better, has MLC flash, a 2 year longer warranty, double the TBW rating (200 vs. 100), and considerably better battery-life performance.
(Granted, the controller on the 950 Pro does run hotter, but in the past I have mitigated that somewhat by installing a copper RAM heat sink on the controller. That reduced its average operating temperature by about 8 decrees C.)
If the 500GB EVO 960 performs well, I will likely order one of those as well (for a desktop), but if it does not then Samsung will have a real problem on their hands: No 256GB Pro 960 NVMe drive, and no high performance EVO NVMe drive at the popular $200-$250 price range. And that could be a marketing disaster.
Since Chris has a 500GB EVO 960 on the way, we'll know the verdict soon. I hope it performs well.