Hello, Does anyone know if they have hard drive upgrades to the 2014 13 inch Macbook Pro's yet? If so, has anyone had a good experience with a particular brand/retailer? Thanks.
Nobody makes PCIe SSD upgrades for the Haswell Macs. Apple uses a proprietary, non-M.2 PCIe blade form. My guess is that if other manufacturers like OWC started making those proprietary form factor PCIe SSDs, Apple threatened to sue them.
There is a thread or two on this very subject on the first page at the moment. Nobody makes them, and nobody likelly will. The only way to get one is getting a used one off of ebay.