I picked up the 900p when it came out. Random 4k read tested about 1/5 as fast as a ramdisk in crystaldiskmark and 5x as fast as fastest nand. The ramdisk theoretically should have been faster, maybe my cpu is holding it back - 2400c10, 5775c oc. Also the filesystem (which will hopefully start to get bypassed more by stuff like directstorage) is leashing drive performance to cpu performance. I don't see that much of a difference over sata nand in everyday tasks.
This new drive will be even closer to ramdisk in performance. And until modern software takes advantage of it, you will notice the improvement in everyday tasks even less. I hope directstorage comes with an optane setting.