It very much rubbed me the wrong way when In the Optane AMA, Intel revealed that they are actually encouraging the shady and misleading practice of marketing low-end computers with 4GB RAM and a 16 GB optane SSD as having "20GB memory".
I use the 16GB version with 2TB Seagate.
What they are doing is shady, but the Optane PCIe devices(including the low capacity ones) are actually low latency enough to provide good enough experience for cases where it runs out of RAM and has to page out to storage. They do responsiveness tests where they say its better to get Optane with 4GB memory than HDD with 8GB memory and that's probably where the practice originated from.
Now, I think that requires Optane being your main drive, but if they expand the feature so it can work as RAMDrive I think it'll have a lot of value. On servers the Memory Drive feature for the P4800X allows expanding of memory capacity. Then they won't be so wrong to call it memory because it'll act as slower memory.
The thing Intel needs to focus on is making it do things that NAND devices can't do, because price parity is practically impossible. Things like replacing DRAM buffers on SSDs, and nonvolatile RAM.
The question is how far away is that?
At that price it is better to use the 118GB version of Optane 800P, same price, same performance, 2X the capacity.
Rather than getting the 118GB 800P for $149, I would get the 280GB 900P for $259. It's faster, and it offers more than double the capacity. The 800P is not worth it at all, and the M10 is really only for laptop vendors.
Both prices on Newegg.