@Glock24 , no big loss that you missed the deal.
I purchased 4 SM863 SSD from the same seller.
3 out of 4 SSD have problems with slow write performance ( 161 MB/s , same speed as a HD ).
I tried using Samsung DCT tools to secure erase it , double checked SSD is connected in SATA 3 mode.
Tried with few other computers.
3 SSD still stuck with very slow write performance , only one SSD is performing normal.
All 4 SM863 had the same firmware GB32.
Returned all 4 SSD and received full refund yesterday.
I been using few PM953 960gb nvme SSD for the past 3-4 years, paid between $65 to $110 each.
I am happy with the PM953 SSD, so picked up 2 more at $45 each from the ebay links above.