I just bought the same from amazon:
Sintech NGFF M.2 nVME SSD Adapter Card
Samsung 970 EVO 1TB - NVMe PCIe M.2 2280 SSD (MZ-V7E1T0BW)
Total cost including taxes and shipping: $260. Compared with OWC $400 you can see that savings could be substancial.
I am not a newbie to computers. I am a programmer working with hardware for more than 20 years. I have been doing my research and I totally think this solution will work and even boost performance in my 15” MacBook Pro (Mid-2015). I will report back once the items arrive an I do the installation and test the system. I will post why and how it works or in case of failure or poor results, I will also report results… Stay tuned.
As to the comments saying that this is not an stable solution, it would be good to have an explanation of what makes it unstable.
Following up on my previous post:
I received the SSD and the adapter from Amazon about 3 hours ago. I am typing this post in my 2015 MacBook Pro with the new drive already installed. The installation was very simple:
1- Removed back cover.
2- Unplugged the battery connector.
3- Plugged the new drive with the adapter.
4 - I had a bootable USB drive with Mojave Install. The machine booted in recovery mode. The new drive was recognized immediately as it would have done with the original. See picture.
I used the Disk Utility to erase the disk and format it to install the OS. That took 15 seconds. Ready for the installation.
5- Mojave installed finished flawlessly.
6- Used Migration Assistant to migrate all Application, Data and Settings from the Time Machine backup done before I began the process. My machine looks exactly the same as when I started but I just went from 256GB storage to 1TB. The best part is the performance on this drive. Here are a couple of screen shots of the original drive vs the new drive.
Old 256GB Apple SSD
New 1 TB Samsung 970EVO
I have already run a number of tests specially to ensure that there is no data corruption (as in CRC errors). So far so good. But I will have to be more thorough. This is just an early report.
You might not have the same result with different hardware. My machine is a 15 inch MBP Retina (Mid 2015).