CableGuy wrote>"... see here:
Cable Kit for 2.5″ PCIe NVMe SSD Drives - CS Electronics
We have limited availability currently, which will be improving in the near future.
Current Web price will be ~$200/kit. ..."
This looks like an expensive solution to a temporary problem. That is the scarcity/cost of SFF-8643 to SFF-8639 (aka U.2) cables.
Furthermore more connections is usually worse. Your approach adds a board with two connections: SFF-8643 and SFF-8639 (aka U.2)
These 'extra' connection is not needed if one has a direct SFF-8643 to SFF-8639 (aka U.2) cable.
No one wants to have to purchase the Intel 750 NVME 2.5" SSD just to get its included SFF-8643 to SFF-8639 (aka U.2) cable.
The group purchase here I think got the price for this cable to $40. The $200 you suggest for your kit would be better used to purchase five cables! And you would save introducing another connection your kit uses.
Question: Couldn't you use your resource to provide low cost SFF-8643 to SFF-8639 (aka U.2) cables. Its just wire and two connectors. Once this temporary scarcity situation is addressed, the price for the cable will probably come down to less than $10!
Actually, if the U.2 2.5" NVME SSDs are going to be the accepted way, rather than the M.2 NVME SSD cards, then a well designed, quiet, 5.25 inch bay form factor which provided for four 2.5 inch SSDs would be the way to go since the Intel\Supermicro NVME capable backplanes is expensive. Make a quiet fan equipped $50 5.25 inch bay accessory that allowed 4x2.5 inch NVME SSDs and people would beat a path to your door!
PS: I sent you a PM message, but you never answered. You need to click on your profile and look at "COMMUNICATIONS".