The newer black Sintech adaptor sold on Amazon seemed to be working very well with a number of users on the Macrumors thread at [https://forums.macrumors.com/threads/upgrading-2013-2014-macbook-pro-ssd-to-m-2-nvme.2034976/page-62#post-26173989|Upgrading 2013/2014 Macbook Pro SSD to M.2 NVMe]
The thread title is misleading. A lot of users are using Samsung NVMe M.2 drives with 2015 Macs without issues.
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2013-2014 Macs would require a modded EFI firmware or some workaround to work reliably.
The newer black Sintech adaptor sold on Amazon seemed to be working very well with a number of users on the Macrumors thread at [https://forums.macrumors.com/threads/upgrading-2013-2014-macbook-pro-ssd-to-m-2-nvme.2034976/page-62#post-26173989|Upgrading 2013/2014 Macbook Pro SSD to M.2 NVMe]
The thread title is misleading. A lot of users are using Samsung NVMe M.2 drives with 2015 Macs without issues.