If you don't want to depend on proprietary Apple PCIe SSD's, I met this tiny M.2 SSD adapter: http://eshop.sintech.cn/ngff-m2-pcie-ssd-card-as-2013-2014-2015-macbook-ssd-p-1139.html
Could also be useful in future Mac's. Just buy a Mac with the smallest SSD, and install yourself the M.2 SSD you want.
Note: 1) NVME SSD's will most likely only work with newer NVME compliant Mac's (October 2016). 2) Enabling TRIM for third party SSD's: Terminal, type 'sudo trimforce enable'
Could also be useful in future Mac's. Just buy a Mac with the smallest SSD, and install yourself the M.2 SSD you want.
Note: 1) NVME SSD's will most likely only work with newer NVME compliant Mac's (October 2016). 2) Enabling TRIM for third party SSD's: Terminal, type 'sudo trimforce enable'
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